标题: MT8880 DTMF???°?¨???à??FAQ [打印本页]

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作者: zing    时间: 2006-7-21 17:12     标题: MT8880 DTMF???°?¨???à??FAQ

FAQ for MT888x

?????????????í??????????°??é????MT888X???ù????×?°???±????????????????????ó???é??
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P1 |= 0xF0; //??????×÷???????±????????1??
_nop_(); //???????????? temp = P1; ///mt8888??D0--D3????P1^4---P1^7
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Q??????mt8870 ?????÷???ó???????????·????????????????±ê×????·?·????????????DTMF?????ó?????????????????÷????????
A???????????????? ±???·ù???????????§????????
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1?????ù???????????? ???·??×?·¨??,?????¨???????????ó,????DTMF??????±?????·????????±???±?÷????,??????·???DTMF????,???±0.5S?ó??·?DTMF????.????????????·????????°?·±????°???·???±?÷?????¨??,???ù???¨????±?????????????.
2??????MT8870?????????????? ??ST/GT????×è??????200k×ó??????????????
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Q????DTMF?????????????????à?????±???à???÷?? ??DTMF?????????????????à?????±???à???÷??
A1????°?100ms·??? 100ms??????????20BIT/S??
A2???????????·×???,?ú±ê40ms:40ms?????? ?????????·×???,?ú±ê40ms:40ms??????,???·????·??????????±???¤????,?à???ü30ms:30ms????,??????????
A3??40MS??????????????????
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Q?????????¨??????????????48V?? ???????¨??????????????48V???????ú?·??????????????????????????
A1???±?????????? ???????????±??????·???????±???????????????????°???????????
A2???????????ê?????????? ??????????????·???????±????????????????????????????????????ò????
A3??°????????ù????????+24V??WHY??
A4????±????????????×?§????×??????????¨?ú???????????????¨????????????×??????×?§????????????????????????????????????
A5?????????ú?·???????????à,????????????????????????????
A6???÷?????±?±???°?ú?????°???à??????,?????????ì??,???·????0.3/0.4??????,?????????¨?°?è??????????,×?????????-60V. /**********************************************************/
Q?????±??mt8880???±??????Cp?¨??12??????·¨ ????8051????MT8880??????????MT8880???±??????CP????????????
A1?????????§?±???????????????? A2?????????????????????????§????
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Q?????????°???í ??×?????DTMF???????????????ú???ú?·?????ó?????°???????????ò????MT8880+?????ú??×????????????????°?????????????ù±???????±??????????°?????????à?ó???÷???????ú?¨???????????????????°???????????ú?±?à?ó???÷??·???±ê×????????????????ó?????á????×??????ò???????????à??×???????????????
A1??48V/1.5K--2K???°?ú???ú?ó??600?·?????????? 48*0.6/?¨1.5+0.6??===8---12V ????????????????0.5MHA????????????
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Q??MT8880??????·???DTMF????????????????·????????ú????·????ù???? ????????MT8880×????????°?é????????????·?×??????ú???°?á?????ù????·???????DTMF????????????????????×÷???é????????°??é?????????á??·??????????¨???°?????°?????????§?? ????????????????·???????DTMF?????????????????¨?????ú???¨???±?????¨????????????·???°????????????é???±????×÷?????·??????????????·?×??????ú?? ??????????????????·???????DTMF?????¨?????ú?????±??·????é????????????°????????????????????????????????????ú?????ù????????·??????????ì??????????×??????ú????
A1???ì??????°???
A2???ì?????????? ??NE567???à?·,????????450??×?,???í??????100??×?,??????×????????????¨,·??ò?????ì????????NE567?ì????0.7???¨0.7????????????????,????????????????,??????·??????ú??????????????,??????????,?ò???±?????????á??????????,???????????ù???é??????°ì? A3?????????????ó????°????????·?????????????° ???????°???????±?á??·???????????????OK???? ??????×???×???IP?????÷???????????ù?é·?????°ì·¨????·???×??????????ò????à???
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Q?? ?±???ù??MT8880?????????????? ????×???????????????2051??????MT8880????????????????????×?????·?????·?×????????í??????????·????¨????????????±????÷?¨???????°????????????????????????????????±????÷?????????ü???????????????????????ò???? ?í?????????????°?????±???????????????¨5V??12V?? ??????
A1??MT8880??????????·¨??????±????÷????????±????÷??????1??1??????±????÷???÷???????±?÷??????/·?????×?????????????°???3.9V?? ?????????°???????????????÷???á???ó??
A2??????????????????????????1?????? ??2????±????ú???????????ú ???????????ó????????????×???????????
A3???????????ú?????????±??·??????????????????????????? ?????????é·?????8880??????±?????????à???
A4?????????????????ú?????ú?±MT8880?????????????????ù???±????±??????ù??????????·?????????
A5??????????±????÷
????????????±????÷?ú???¨??±????÷????????±????????ò????±????÷???±?ò????°???±???????????±????÷??????????????????1??1??1??2????????????????????±????÷?????ò????????????????????????
??????????????????·?×??????????í???????°?????????·±????ò?????????????ü??????×÷???????ù???°??????????510????×è??1u/250V???????????????ù???????????¨??
|-----510Q-----| LINEA------------- ------| |----- |-----1u/250V--| ???? ±????÷ LINEB-----------------------------------| |------ ??????????????????????????±??¤????????
A6???????·?í????????????????????×è??????????????????
A7??puntoo??×ì???? BTW??hydnet??????????????????·??????°????????????????Modem?????ó???????í???????ù???????????¨???????????????????????°?±??????RJ11???????????????¨???ó?????????????¨???????ó???????????±???????°?????????????ò????ISP???????¨±???163????????????????????TCP/IP?????????????ù??·??????????ú????????????
A8???????ù?????????????????í???¤à?!
A9??????????????±????÷ ????????????????????°????????§??????·?·????ó??
A10??a12345678????puntoo puntoo?????è???????????????? 1???????ú?·?????????????? 2??????·???????????±?±??¤????33600bps???¨????????
A11??????·????????????°???·???????ù????????????450HZ ???????????????????ú·????????????????????????????????°??????????·??????¨?°???????ó???????±??????°ì?? ????????????????×?????????????????×????°?ú·??????é???é????????
A12???????á???????ó???????ù????????????·¨?????????· ?????÷?????????? ????????????±????÷?¨?????÷?é·????????????ù????????????·¨?????????????á???????ó???????ù????????????·¨?????????·?? ???è?????????????¨???????ù???? AT89C2051????MT8880????LM358????4066???????????·
A13??re:a12345678 ???°?????ò???????±?ò????????????modem???????°??????????????windows????????????????????????????
A14??×?????????±????÷ ?ò??: 1?????°???·????????,??±????÷????????????????????????,·???????????·?±?---????±????÷?????? ???ú????????????±????÷,??????±????÷??????±????÷,??°???????±????÷??1??2?????????é?·,?????? 2?????????????????°??????,?×??12·ü??°ì·¨?á??,5·ü??????,???÷????????????????,?????????????ú????,??????????.
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Q???????ì?????· ?÷???ó????·??é???????????ì?????·?????????????????????????? ?ò·?????????
A1???????±?????÷???????±?????±?÷ ?????????????±?÷????????OK????
A2??????????,?????????????? ?????????±?÷,?ó????????????,??????·?(????)????????????,?????×??????
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Q??????????°?·??????°????·?·??±???ì????·?100?×-250?×???????ù??
A1??1.?÷????2??????????3??°?×°?±???÷???ì????????????????à???
A2???????????????ì????·????????????????????????ù????
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Q???????????°?ú???·??????±??ó??????????????????
A1???÷?????????·????
A2??????°????§?????°?ú?????ó???????????????????????????÷?????? ?ü?????·×è???????????×?????ì?é?¨????·??????? ????????????????????×è???÷???? ·??????????¨???????·??????????????
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Q????????????MT8888??DTMF??·???????????????????2??4×????? ??????????MT8888??DTMF??·???????????????????????2??4×??????????ü·?·¨????2??4×????????????????é????
A1?????è??2--4×???????????????·??ó?±??????????
A2??2??4??×????????????§??±??????????????????????ò?????????ù????2??????????????????PCM????×??????????????ò???????ù????4????
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Q?????°????????????????·????????????????¨ ?????ì?????°???????????????????????????????????????ù?????????????????????????????¨??9014??3904?ò???ü??×???c,e?á???¨?????????????????÷????????????????
A1????????????·??ó??????
A2????????????????
A3??·??ó???÷???¨
A4?????????ù×??????????°???????????÷????,?ò?????????°??????????????(<50?·)??×è,????×è????????????·??ó???í???ó???¤×÷.????????????×è?????·?????à????1V??????,???????¨?°?°?ì???ó.
A5???????????????????°????????·???
A6?????ü???????????? ???????????¨?????°??×?????????DTMF????
A7?????°????????????????·????????????????¨ ??????????DTMF????????????????????????
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Q????MT8880???°?÷?ú?????????ì??·??ú??DTMF?????????????????? ??MT8880???°?÷?ú?????????ì??·??ú??DTMF??????????????????·??ú?? ???ú???????????????????????¨???????????ì???±?????à????
A1??450Hz???????? ???? 33ms ???? 450Hz 1s??1s ???ú 450Hz 1s??4s
A2?????°?????? ?????? 450Hz ???? ?? ?? 450Hz 1s??1s ?ò?? 0.35s??0.35s ?¨???? ?????? 450Hz 1s??4s ?¨???? ±????á?ú ????????
A3?? ???? 33ms???á????????×?????60??75ms????????±?????
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Q?????°????·??????±????MT8880??IN????TONE???? ???°????·??????±????MT8880??IN????TONE???? ?è???è????567?÷?????????????÷???? ??·???·???????????????????IN????TONE??????????????????
A1??1???¨??×è?? 2?????è???????????????÷???¨???????÷????????±??¤?? 3??????
A2??????????21IC???????????ì???? ??±?????????????????·??ú??
A3????????×??????ò???????÷???????°?????·???÷
A4?????????í??????
A5???????????????????????????? ????????????·??ú?????ù?????é???????÷?ú??????·??ú????×???????????????????·¨??????
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Q??????MT8888????DTMF???°?¨??????°????????????? ????MT8888×??¨?????????????°?????ù?ì?????????????ú?????????÷°×????×????????????????????í????????×?????·??????é???ó???????????í??????°????à???? ????????????millin@51arm.com
A1?????????°?ú???????????·?????????????????????? ?????????ì???????????á???°???????ú???·??
A2????????????????????????????????
A3??????DTMF?ì????·??????????????????í?????????ú???·?????????÷×?????????????±????????è?????????????????·??
A4???????????????ü???????????÷?????÷??????????MT8880 ???????????ú?ú???¨?é??????CMD8880,±?MT8888????±?????°??? 8888??8880???????????ù???????????? 8880??×?????????????×???????
A5???????????°?????????????????ú???ò??????×????ò???°??????MT8880±?????????????
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Q?????????¨?°?ó?????ì????·????ú?? ???????????ú?á·???????±ê???? ????±ê?????????ù??°???
A1??????????????????????
A2????????
A3?????ú?????????à??°??? ?????°?????±?ò??????????±?????°??? ?¨?°???±?ò???? ??·??÷?????ú?±?ò?????????à??°???
A4????×?????????±?????
A5???ì?????????? ???°?????????????????±?÷10??·ü????????????0??75??????????450hz???÷?????¨0??35s?¨??0??35s???????????????????ì?????·???????????? ????????????
A6???ì?????ú ?????ú???ì???????????????ú??×?????±????÷?????????ú?????÷???ù?????????ú?????é?????§???·°??????·?ì??????±??????????ú????±????ù?????????ú?????é?????§???·°??????·?ì?????±±??????ú???ò±????ù?????????ú?ì???????ú?????ó?????÷???ù?????????ú????±??????ú???????÷?ú?????ú?????????????ó???????????÷????
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Q???ó?ú??mt8880?????¤×÷?????? ??????×?????mt8880?????÷???±???÷???±?????°???????¨??????8880??·¨??????dtmf?????????????ò?????????·??????????8880?????¤×÷?ò????8880??????????????????????????8880??°ì·¨????????????????°?????????????±????è?????±?????à??????????????
A1??????????????DTMF??·ù????????????·??ó??????
A2?????ó·ù?????à?ó??????
A3??×????????ó??0.3·ü??
A4??8880??·??ó,???ü?????????ò??????
A5??2?????????????à?ó?? ?????ì×???????2??????????20??·ü?????????????????????????????·??????????????·?×??°??·??ó???????????????ì?????÷???????÷???????ú?????????????????·?ê?????±??????????×????ò?ó???????????????????????????????·???ò??????8880?????¤×÷??????????·??????¨??p04-07??????8880???????±?ò?????????????ì?????ò???í???????????±?ò?????????ú???§???ò???°·????é·??????????????????????°?ì???????ó????????????????×÷?????±?????à?????????ó????°?????
A6?????????????? 8870????????±?DTMF????,8880?ü????,??????±?????????,??????????8870×???????????????8421??,???????????±???÷????????,????????????°?
A7??p0??????????×è?????? p0????????????×è???í????????×??????è???????±?ò???????????????ù??×?????????×?????????8880??8870???????????ò??????×???????·??????í?ó??????????
A8??????±????÷?????°???????????????????÷???????
A9????????±????÷???ò??????????????±??¤ 1?? ?ò?????°??°???°??ü?ó?????ì8870??ESt??·???±????????????????????????ò?÷??8880?????±??ESt??DTMF?????±??±????? 2?? ??×??ì?éSt/GT??????·???DTMF?????±???????????????????????????????????????±????MCU?????????±?ò???????????????¨?????????? 3?? ????ESt????±???????St/GT???????????¨?¨????????°????????????????????ò?÷????????ESt??St/GT??RC????????St/GT???????????????ó???????±??????????????????????RC???????¨DTMF???§?¤???????°????DTMF?ó????DTMF±????????à?¤?±??????±????????±???±?????¤???á?ì???????????????????×???ó????×????????????????? 4?? ?÷???±×????????°??????·??÷??????????±?????PC?????????????·???????????????ù???????á?°?ì???????±???????°????????±????÷???????? ×??ó??MT8880?????é????????×????????÷?ê???????÷??·????±??·??????????ú?ú???±?÷????±????????????????????????á?????????¨·????????±?·?ó?????ì????????·????????????ó???????????????????????????????? ?¨?é??????????
A9??????MT8880??????????·??????ò?? ?????????à???????é???ó????·?°???????????????·??????ò?ù??????????????
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Q??MT8880???????????á?ú?ú±???! ??×?????????MT8880??MAX232??????,??????????MAX232??????PC????8880???á?ú?ú??×é±???,???ó???°????·¨?ò???ò?????????°?×????????????é???????á·??ú. ???×??????????
A1?????°????PC??????
A2??°?!??°?!???????????????????????????·¨? A3??PC??????????????±????÷
A4??PC?????????MAX232????????????¨?????
A5??PC??220V????
A6???ì??!???????ò????????·?·¨.???????ó????,×?????°?×???????
A7???????????°????????????±????÷
A8????!??????!?é·????ê??????. ????????????????±????÷,?é·????ê??????.???????????????????·¨?
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Q??????????8870?????ì?????ò???????°?? ??×??????????????????????÷?¨MT8870+AT89C2051+MAX232???????????????±?????ò???°?????¨?????????±??MT8870???????°?????????¨??AT89C2051????MAX232????·??????????? ???????????????±?°?????????±?ò??°????????°???????????·?????????????????????????ò?????????°????????????MT8870?±???????????ò???????°?ú??·??ú???×????????????×è???????÷????????????????????????×?????????·??????ó???????? ?¨???ù???????¨???°?????¨??????????MT8870?????????????????ü???°??×è?????÷??????datasheet???ù??????????
A1???????????????í???????í????
A2?????????????????????????????? ???????????????????????????°?ú??????????????????????
A3???????????¨???°??????????????????FSK????????DTMF?????ò?????????¨????????????
A4???ú±ê??fsk?¨bell202?? ?ú?????ú?ú?????úhjd 04 ?????????ú???? dtmf ?????????÷???????????????°?????????????? ???°?ú????°?×????????????????????????? ?í?????????è???????????ê?????¨?¨??·?????????·??ò???á????????????
A5??????dtmf??fsk???????? ??????????????dtmf??fsk???????????????????????ü?????á???????à?????ò??????·????ò???????ú??????°ì·¨????±??? ???????·???ò???? 1???????°???·????????????????????±?????????????×÷?????????????????????í????????????????0.022uf/250V????????×÷?????????????????ó±???????10k????×è?????????????????????????÷?????¨???¨?÷????????×è????·?·??ò?÷????????????????????×÷?????÷??·ù±??¤?÷???????????é??????×è?ú?ú???????????? 2????????????×è?ú?ú???°??°??????°?????í????????????±???·??ó?÷???????ó????±????ú?ú?ò????°??????????? ?ù?????????ù????±??? dtmf???????????????????????????????????°???????????°?????????ü???ü?????????????¨4bit???????????????±??????????????dtmf???????????????? ?????à·???fsk???????±?????????????? ?ù?????????÷???????????????????×????±??????? ??????×÷??×??????°???·?????÷??75V20Hz?????????????ò???????????á???????? ?í??????±????÷??????dtmf??????????°ü??????16??dtmf±à???????°D?±??×÷???·????start?????????°D?±???????°?ú??????????12??dtmf±à??????????????????dtmf?????÷???è?????è??×???????????·??ò??????????start?·?????°D?±???? ±???±?·?°????????????à?????????????????????????÷????????????
A6?????????????????ú??????DTMF?????????????????????ú???±????????????·??ò?????ú????????????????4????DTMF??????±???ASCII??°????????????ù?????í?????????÷?????é?? ???????????????????÷DTMF?????????÷FSK??????????????
A7?????????? ??°????°?ú???????????éIC?¨fsk decoder??????????mcu??????
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Q??????mt8880?????°???????????÷???°±????? ??????×?????×???±¨?????????????????????????????????÷??°??? 1??mt8880?????°????????°?????????????×????????????¨?????÷???????????¨??????±????÷?????? ????????????°?????°???????°??????ê??????°??????????ì???? 2????????×????é????????·??ú?????à?????????????é???????????ù?????????°???????ù°??????????á ?????é°???
A1???¨?????÷???????????????????§????×????????????????ù×?????????????????
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Q???????°?????????÷×??à?????à????°???±??¤?????? ?????°?????????÷×??à?????à????°???±??¤?????????? ???????????????ú???á?????????ú
A1??10mA
A2?????????????ú?????????????°???????á???ó????1ma??????
A3??10??°?×ó??,?????ú??±ê×?????6??°??????????????¨.
A4?????????????÷±í?????????????????ó??????6ma???±?ò??????????
A5??????±ê×?????500uA ?????????¨???????????í?ú??
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Q??????8880 DTMF????????·????? 1????????????????????????????±??¤???·?? 2??8880???????ú????·¨????????×?????????????·???
A1???±????±??¤?????????±?ò????·?×???????????????????°???
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Q?????????? MT8880?????? ????MT8880??MOTOROLA568?????????ú×????à???? ?????????í?????????±?ò?????????? ;*****MT8880????******** d0 BIT P1.0 d1 BIT P1.1 d2 BIT P1.2 d3 BIT P1.3 cp BIT P1.4 r_w BIT P1.5 s0 BIT P1.6 cs BIT P1.7 ORG 2000H JMP main ORG 2100H main: mov 40h,#01h ;?????°144 mov 41h,#04h mov 42h,#04h mov sp,#67h mov r0,#40h mov r1,#03h ;********??CRA??CRB********* clr cs clr cp clr r_w setb s0 mov p1,#4dh setb cp nop nop clr cp mov p1,#40h setb cp nop nop clr cp setb cs ;*********·???DTMF????******* clr cs clr cp clr s0 clr r_w looP: mov a,@R0 anl a,#0fh mov p1,a setb cp LL1: lcall check JnB ACC.1 LL1 clr cp inc r0 djnz r1,loop setb cs ;*********?ì??SR×????ò************* check: clr cs clr cp setb s0 setb r_w MOV P1,#6FH SETB CP mov a,p1 anl a,#0fh clr cp setb cs ret end
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Q???ì?????°?????? ????????LM567?ì?????°??????,°?LM567???????÷??450HZ,?±°??????±,(0.35???¨,0.35????)LM567????°???????????????0.35????????,0.35????????,???????????????????????????ù,???????±??????0.35??????????,????????????,??????????????????ò?ó??????????,????
A1??????LM567?????????÷×? ??????±?±??? ???????????ú?????????????????¨??450hz,?????à?????ó??????400hz?????? ?????????????°??????????????????°?LM567???????÷????????
A3?????°?????????ù×????????????? ?????ê??????±????ì???????????ò????????????????????±ê×????ü?????á?????????? ?????????á??????"?????ò?????°?????ú"??????°ì???? ?????????ù?????????ú???÷????????????±?????·????×????????
A4??"?????ò?????°?????ú"?????°????450hz??????·??????????????????±????·????? lm567???????????????????????ê???????í?????????? ?????????ù×??????§???????í??
A5????????????·?·¨?ì??°? ??????LM567?ì?????°???????????????????????????·??á????????,??????????·?·¨????í????????,?ì??5?????????????
A6??°?LM567????????·??§?÷?í????????
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Q???????ó???????ì????????DTMF???????????????ì???? ??×??????????????·???????¤×÷?????????????????????????ó??DTMF?÷??±??????????¨????????·????????????????ú??·¨??±????????ó?????????????ò??????????????????ht9200??isd1100,?ü?????????????????¨????????×è?°?????ó??????????????????????????·??ó???? ?????ó???????????????¤???¤
A1??????????DTMF?????????ó??,???????????????? ????°ì·¨: ???·??????????×è??
A2???????????ù??????????????
/**********************************************************/
Q???????ó???????????°??·????????????ì???????? ?????ó???????????°??·????????????ì????????,?????à???·??????,????·????±(±??????ú??·?????,)??????????????·??ê?????á??(????????°?1,??????°?2,.......),???é?????±??°?1,????1????,??????????×???????????,??·??????±???ì??????°??ü????????,????·??ê?????ó????,?ó????????·?·¨????????,?è??????????????,????.
A1?????????????????????????????ì??????
A2?????°????·??????±,??HT9170?ì????????·?°??ü
A3?????°????2/4??×????? ????????·????????????????ó???ì???? ????????????????????????????????????????
A4????????????????????°????±???????? ?ò??°??ü????????????9170??????·???
A5????????,???±?ò??,???±????,???????é, ??????,???±?ò??,???±????,???????é,??°???°???????????,(°?????????????????????????????????????????),??????????????????????????????????????????????????????.??????°ì·¨°??ü??·?????,????9170????????????,?????????à.
A6?????????????????¨?÷??????
A7???????????¨?÷ ????????????,???¨?÷??????,?????????·,??·????ê????,??????????°??????????????????????
A8??????·¨?????°?á????DSP±?9170?? ???????¨????????????????????
A9???????à?????· A10?????à???????,??????????????? ???à?????·???????°??×??¤???ó,?????????????????????????????ì??????,??????????°???????????°?,?????????????ù???á????,??????????????????
/**********************************************************/
Q???????????????°???????ù?ì???????ú±í?????? ?????????°?ú???????ù???¨?ì????????????????°??????°????4?ù?¨?ì????????????????????????????????????
A1?????ù????????×é°??????????????·????
A2?????·???????ù????????
A3?????·???????ù?????????????ù???????±?ò??????????·?°?
A4?????????????°????°?????. ????פ???°?????? ?ì??פ???°?????? ???????ù?÷ ???????ù?÷
A5???????????????????ì????ok???????????????ò??°????????á??????ing ???????????????????????ì??????????×????????????????????????????? ????????????????
A6??°??? ??±?±? ????????????×???°? ?? ???????ê?????????° ???????°?ú ?????????¨?? ?? ????????????°????????í?????????? ?? ?????§??±?2???????????? ??
/**********************************************************/
Q??????MT8880?????? ????????×?8880?????ü?????????ó?÷°× 8880?????°???????????????¨????±????÷?????? ????????DATASHEET??????·??????????????±???????ù???°???à???? ????????DTMFOUT???????°??????
A1??·?????????±????÷??????
A2?????°?????°±??????? ????????±????÷???????????????????????÷?? ????????MT8880???????????à?à°???????????????????????
A3????°?????????,?ò?????·???????à??????,??°????±????°à×?
A4?????????????? ????±????à??600??600
A5??dtmfout??·¨ ?????????????????????????°????
A6????TONE????????DTMF???????à?ó????????????·??ó???í?ó??????????±????÷???????? DATASHEET ???????·????R??C???????????????ó??????
A7????????°? ????·???×??ê???????????????????????°?ó°??ú??????????????????×???????×??????¨???à??·?·¨????????????????????????????8870????????????????????°?????????
A8??????·??ó,?ò??????,????MT?????????÷????
A9?????????????? ·??????????÷??????1?????????·?????ì??????????2???°??·??ó?÷?¨???????????????????¨??·??????????????°???÷?????????????????????ó??????????????·?????????????
A10??????????DTMFOUT????????·??ó?????ó?¨??±????÷?????????°??????
A11?????????÷???????????????±???±°????°?ü?±??8880??Est????St/GT???á??????????????????????????????????????????????????°????í???????????????÷???·?????????????÷??????????
A12????????8880???????? ?????????????±·?????????D0???????????????·??????????????°??????ü????0?????ì?é??????·??????????????á???á??8880??????
A13???????????????????????¨????????·??????ò?????í?ó???????±??????????·?????????????±????÷?¨?????????ù??±????÷?????±??×è????????·????±????????????±????÷????
A14??????MT8880AE?±?ò???±°????°?ü?±??8880??Est????St/GT???á???????????????????????ú?ú??????????°?irq/cp?????????????°?????????????·???????????????????ò??????CM8880PI?????????????à?????·????
A15??????St/GT?????????????????÷?????ê?????????????????????????÷??????????CRA???????è??????·??????????????é??·???????
A16???è???±?òCRA=D(1101),CRB=0(0000)?????????????????????ú?ú?????±?ò??????±???????MT8880AE?±?ò????????????????????????????CM8880?±?ò??????±????????????????±???????¨???????ì?????????????????????ò???à????????????????MT????±?????????????????????·??ò??St/GT?é????????????????????
A17???????é×????????÷??b2??
A18??????MT8880??????????????????????????·?????·????????ú?úDTMF?????¨?????????¨?÷???????? ????????±????÷???????????ù??DTMF?????????????°??????????????????????????±????÷???±??×è?????????????????????????????????????ó?????°????????????????°????°?á???????????ò?????????????????·?è???????¨???ü??2?????????????±????????????????????????????2???????????????????ó????????
A19???????????ò???±????·??ú?é??·??? ????????±????÷?????????·????????21ic??????±à???????????????????????? ?°TONE??????10k??×è??9014??b????9014e????260?·??????c???±?????????°?????????í?????°????b?????????????·??0.1u??????100k??×è?????÷·????± ???°??bbs??????
A20??Anitya??????·?·¨?????????????????????¨??×????????±?????????????????????????????°????·?????????????????????????±????÷????????????????????????????????????????????
A21??????????600??600?? ?ò?ò??????????945??????????????????±?????
/**********************************************************/
Q????????MT8880???÷?????????????? ????MT8880×?DTMF????????·??????????±?ò????????·??????????????????±???????????±?????±?????????ú?ú??????????·ù??1V×ó???????·????DATASHEET???????????????§???????à?ì???????ó??°?°???????????????BTW??·??????±?ò·????±???¤???????±???ò????????
A1?????????????????????ì?é?? 1????·??ò???????????????ó?????? 2???§???????? 3???????????????±?????ó??50mS?? 4????????×÷?è??????.
A2?????????????ò·?·????????????°cp????????????·???cp???????????????¤×÷??????·????????????? ???°?ú??·??????¨??????2????????×ù?±????????°??????±??????????????·??????????±°?×??ü??·?????????
A3??????????????????????·ù?????ó datasheet????????·ù????27.5??869mVRMS??BURST MODE????DTMF°??????¨?????±????????·?????????51mS??·????ó??????TRANSMIT DATA REGISTER EMPTY??????????Anitya??CP??????????????????±??????????ú???????????????????°?ú???????§?????ú?±????????????????
A4??darwin???????????????è??100ms?????á???á????????51ms?? ???????ò????×??????????×???????×??????cp·??????????????????·?????????? ???ù?????????á??????????????????°?????±????????????ó???????ó???à?à??????
A5????BURST?????±CP??1???????±??????????102mS????????????????????????????????
A6??·??????????é×????????÷??·?·¨???????????±??·?·¨°??? A7??·?????MT8880AE?????ì???????§DTMF???????????????ú?ú??(Est??????±???) ????CM8880PI?ò??ok??°?~~~
/**********************************************************/
Q??mt8880????×????????? ????mt8880??????×??·??????dtmf??????????·???100ms??dtmf?????¨???????¨?÷????tone???¨????????????????????×????????????ó??????dtmf?????????¨????????????·??ó?????¨?????????÷???????????°??????????????mt8880????????????×???????×????????????????????ú?ú100ms??dtmf??????????????????·??ó???????????????§???????????????í?????????????ó??????????°??ú°?
A1??×??????????????????? 8880??8888???à???????????°?úר?????????????§??????×??????????ü??°????????ú?¨??4??×????????????????????ò????±????÷???????°?????ó?????ó???ò?????§???????????ó??
/**********************************************************/
Q?? ????mt8880?????à????·??°?ú???????????ú????????????????????????
A2??????8880cp????????×??? ???????????????ú???????????¨???à??????·¨??????????×?????????×??????????????ù??
A3???????????ù
A4????????ר?????????ì???????????????????????????ì?????·?ì???¨???·?????????í?à?é?????°??×?????????????????8880/8888?????±???ì???????????ú?????ú?????ì?????°???????????ò???÷??????????
A5??CR6230???????°??????????????????????????????±????????¨???÷?????±????????±??á????????MCU?????è??×÷??????±????í???±??????×???????????±??ü??×??·?????????×???????°?à???ú?·????????±???????
/**********************************************************/
Q??MT8888???????????????????°???????? ????????±????÷??????????8888????????????·?·?????2V??????±????÷±???1V?????????????°???????á?????????¨???ó?????°?????ù±????ì??????·????????÷?????????? ?÷???ó??????????????°ì·¨?ò???·°?????
A1?????°?ú???·????
A2??????·??ò??????·??ó?ó????±????÷!!
A3??·??????· ???????????ù??,?ù±?????????·??ó???·??·???????·???,°?tone?¨???????????????ù??????????
A4??readheart
/**********************************************************/
AnityaQ??MT8880????DTMF???????? ??MT8880×?DTMF???¨?????¨???°?ú????8880????????·?????????????????????1??ר????DTMF??·?×°?????????·×????????????? ???????¨???????????ù??????·?(B)????????????·?(A)???????????ó?á?ú??·???????DTMF?????¨????????(B)????????(A)·??????????ó????·???????DTMF???? ???????á?ú?ó?è??8880??·?????????·???DTMF?ó???????????????????é??IRQ/CP?????????????????ú?ú±???????8880?????????÷?????ù???????????????????±?ò????(B)??(A)??DTMF????????????????????±????????????ì?????????¨?÷???¨??????(A)·??????????ó????????????(B)·?????DTMF?????????????????±??DTMF?????????±????250ms×ó???? ??????8880????·???????×????????????±?è???????????¨?±?????????????????????????????ò?????????? 8880??PC??????
A1??Anitya,???????????°?????±???ò??????MT8880????×??????????? ·?????????????????×?????????????MT8880???±?ò????????????????????????DTMF??????????????????·??????????????????????????????°?????????????? ??????????????????????124578*0#?????ü??369??????????????????#????369????????·??????ù????147???ü??369????????·??????ù????????????????????????????°??¨??????????.????×?????????????Est??St\Gt??????????????×è???°?ì??
A2?????¨?é??????????·???. ?????±?????????????????°????????. ???????ó????????·¨?
A3?????????? IN?? ?? GS??????×è???????÷???????????????????÷?÷???????????·??????1/2?? Est??St\Gt??????????????×è×é????RC???????÷???ì???????§?????¨?????±???¨????????????°?????????MT8880pdf??????×??????ê???????÷???????????? ??????369???é?????????????????????·???????????ù???????????ó????????
A4?????ù???????????? ???·??×?·¨??,?????¨???????????ó,????DTMF??????±?????·????????±???±?÷????,??????·???DTMF????,???±0.5S?ó??·?DTMF????.????????????·????????°?·±????°???·???±?÷?????¨??,???ù???¨????±?????????????.
A5??????MT8870?????????????? ??ST/GT????×è??????200k×ó??????????????
A6??????????ST/GT????×è??200k????·????????300k×ó????????????!



/**************************************************************************************/
Q???????÷?¨MT8880??????×????????á?????±???????????? 1???÷?????×?????·?????? ???????°?ò???ó??±??????ú?????????°°????????ü?????ì8880??Est??????·????????????????? ???????????????ò?÷??8880????(??????????×è????????Rin=56K,Rf=100K)?±??Est??DTMF?????±??±????? ??×??ì?éSt/GT????????·???DTMF????(???????°°????????ü)?±???????????????????òDTMF???????????????????????±????MCU?????????±?ò?????????????¨?????????·???????? ????Est????±???????St/GT?????????????¨?¨????????°????????????????????ò?÷????????Est??St/GT??RC?????¨????????C=0.01u??R=330K??????St/GT???????????????ó???????±??????????????????????RC???????¨DTMF???§?¤???????°????DTMF?ó????DTMF±????????à?¤?±??????±????????±???±?????¤???á?ì???????????????????×???ó????×????????????????? 2?????÷???????????¨????????·????÷???????±????????×??÷???? 3???????¨?÷?????¨???±?????·±????¨?÷????????(????×?????????????±????÷????)??·??ò?ú?ú???ó?????????????????????·?¨???? 4???????±?ò ??????????MT8880?±??Q2??±???1us??1000us???????????????????±?ò?ú??????(12MHz?§??)?? ;?????ú??????P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 ;MT8880??????CS RSO RW Q2 D3 D2 D1 D0 ;??×??? 6xH??0 1 1 0 x x x x ;?????? 4xH??0 1 0 0 x x x x ;?????? 2xH??0 0 1 0 x x x x ;?????? 0xH??0 0 0 0 x x x x ;---------------------------------------------------------------------------- ;??×????????÷SR?ò?????????÷??????A?? CPR: SETB Q2 ;Q2=1?ú?úQ2???????? NOP ;Q2???????????? NOP MOV A,P1 ;??MT8880×????????÷ ANL A,#0FH ;??±???????,?????????? CLR Q2 ;Q2=0?ê??????Q2?±?? RET ;---------------------------------------------------------------------------- ;???????????÷CRA??CRB?ò?????????÷ CPW: SETB Q2 ;Q2=1?ú?úQ2???????? NOP ;Q2???????????? NOP CLR Q2 ;Q2=0?ê??????Q2?±?? RET ;---------------------------------------------------------------------------- 5????MT8880??????????????(???ò?ú????)?????????????????? ;-------------------------??????MT8880---------------------------------------------------- MOV P1,#6FH ;CS=0 RS0=1 RW=1 Q2=0 ACALL CPR ;?÷????×????????÷SR,????A?? ;CS=0 RS0=1 RW=0 Q2=0 MOV P1,#40H ;??MT8880?????????÷CRA=0000 ACALL CPW ;?????????????÷ MOV P1,#40H ;??MT8880?????????÷CRA=0000 ACALL CPW ;?????????????÷ MOV P1,#48H ;??MT8880?????????÷CRA=1000 ACALL CPW ;?????????????÷ MOV P1,#40H ;??MT8880?????????÷CRB=0000 ACALL CPW ;?????????????÷ MOV P1,#6FH ;CS=0 RS0=1 RW=1 Q2=0 ACALL CPR ;??×????????÷SR??????A SETB CS ;CS=1 ;-----------------------MT8880???????á??---------------------------------------- 6??MT8880?è????????DTMF?????????±???????????§DTMF?????????·?????ó????IRQ?????ú?ú????????????????±????????°????×????????÷?±??????×÷????°?IRQ??????????×???????????·??òIRQ???????±±?????×???×????????????±?ò?? 7????×????????÷?±????×?????(???????±b2????1?ò±í???????????§DTMF????)????????????????????(?ú??????)??????×????????÷?????????¨???????¨????????×÷±??????????????????????????ò????----?? ;??×????????÷???????????????ú?????? RDSR: CLR CS CLR Q2 SETB RSO SETB RW ACALL CPR ;??×????????÷SR ;????b2?????????????±?????????§???? ;??×????????÷?????±?????????????ú???????? RDSR: MOV P1,#6FH ;CS=0 RS0=1 RW=1 Q2=0,??????????????"F" ACALL CPR ;??×????????÷SR JNB ACC.2,RDSR ;????SR??b2=1????=1???÷???????§???? ;?????????±?????????§????
A1??????????????: ??St/GT???????????????ó???????±??????????????????????RC???????¨DTMF???§?¤???????°????DTMF?ó????DTMF±????????à?¤?±??????±????????±???±?????¤???á?ì???????????????????×???ó????×????????????????? ????40????,????±???±?,?ó??50????,??????±???.(??×??ú±ê)
/**************************************************************************************/
Q???ó??MT8880?ú?ú??DTMF?????¨????????????????????·?·¨ ?÷???ó?????? ?????¨???????ú?¨89c51????MT8880?ú?úDTMF?????????¨????????????????????????????????MT8880 ??8??(TONE)?ú?ú??DTMF??????·??????±???¨?????????????????????????????????°????·?????????LM386??·??ó?????????????ó???????à????3000?×
A1????°?DTMF?????÷????100K×ó????????
A2??±????????????????¨?÷?????? ?¨?é??????·??????é??×??????????÷°×??????????
A3??·????????????????ó???????????? ???????? ???ù????°?DTMF?????÷????100K×ó????????????·??????????ò??????×???×????????·???????? chunyang ?????? ?????????¨?÷??????·??????é??×???????·?????????±??????????é?????????????????????????°·???????????????????????·???????????
/**************************************************************************************/
Q??????mt8870. ?????÷???ó???????????·????????????????±ê×????·?·????????????DTMF?????ó?????????????????÷????????
A1????????????
A2???????????????? ±???·ù???????????§????????
/**************************************************************************************/
Q??????MT8880???±?ò,??±???R/W,RS0,CLK2??????????.
A1?????????????????ê???????÷?? R/W???????????????????? RS0??????×÷???ó???????????÷?????ü???????÷?? CLK2??????????×÷???¨?????????????÷CLK?????í???? ????×÷??°??? ???è??????R/W?¨?????????? RS0 CS ???ó??CLK2???ú?ú?????????????±???????í?????¨???ó?????????????????? ???ó???????? ?????°????????×?±??????????????à?????????????????ò??????×???????????????????
/**************************************************************************************/ MT8880?à?????ò sbit DTMFOK = P3^4; //DTMF×????ê????????????·?????INT1 sbit HZ450OK = P3^2; //450Hz?°??????????????±??????? sbit CS8880 = P1^6; //8880???? sbit CLK8880 = P1^7; //8880?±?? sbit RW8880 = P2^4; //8880??????????0?? sbit RS8880 = P2^5; //8880?????÷??????0?????????÷??1?ü???????÷?ò??×????????÷ /*************************************************************************************/ uchar Rd8880Da(void) /*************************************************************************************/ ????:uchar Rd8880Da(void) ??????·?????MT8880?????ü??a ????: ????:?????????? ?÷??:·????ó±????????±?ó?÷??CL8880 ****************************************************************************************{unsigned char rdata; CS8880 = 1; RS8880 = 0; RW8880 = 1; CLK8880 = 0; P2 = 0x0FF; RS8880 = 0; RW8880 = 1; CS8880 = 0; // Delay(5,5); CLK8880 = 1; Delay(1,1); rdata = P2&0x0f; CLK8880 = 0; // Delay(10,50); RW8880 = 0; // Delay(10,50); Cl8880(); return ( rdata); } uchar Rd8880St(void) /***************************************************************************************????:uchar Rd8880St(void); ??????·?????MT8880×??? ????: ????????????×??? ?÷??:·????ó±????????±?ó?÷??CL8880 ****************************************************************************************{unsigned char rstu; CS8880 = 1; RS8880 = 0; RW8880 = 1; CLK8880 = 0; P2 = 0x0FF; RS8880 = 1; RW8880 = 1; CS8880 = 0; // Delay(100,50); CLK8880 = 1; Delay(1,1); rstu = P2&0x0f; CLK8880 = 0; // Delay(100,50); RW8880 = 0; // Delay(50,50); Cl8880(); return ( rstu ); } void Wt8880Da(uchar da) /***************************************************************************************????:uvoid Wt8880Da(uchar da) ????????8880???? ????:da,?????? ?????? ?÷??:·????ó±????????±?ó?÷??CL8880 ****************************************************************************************{ P2 = 0x0FF; P2 = da | 0x0F0; CS8880 = 1; RS8880 = 0; RW8880 = 1; CLK8880 = 0; RS8880 = 0; RW8880 = 0; CS8880 = 0; // Delay(100,50); CLK8880 = 1; Delay(1,1); CLK8880 = 0; // Delay(100,50); // RW8880 = 1; // Delay(50,50); Cl8880(); } void Wt8880Cr(uchar da) /***************************************************************************************????: void Wt8880Cr(uchar da); ????????8880?ü??×??????÷ ????:da,?????? ?????? ?÷??:·????ó±????????±?ó?÷??CL8880 ****************************************************************************************{ P2 = 0x0FF; P2 = da | 0x0F0; CS8880 = 1; RS8880 = 0; RW8880 = 1; CLK8880 = 0; RS8880 = 1; RW8880 = 0; CS8880 = 0; // Delay(100,50); CLK8880 = 1; Delay(1,1); CLK8880 = 0; // Delay(100,50); // RW8880 = 1; // Delay(50,50); Cl8880(); } void Cl8880(void) /***************************************************************************************????: void Cl8880(void) ????????±?8880 ????: da,?????? ?????? ?÷??: ****************************************************************************************{ P2 = 0x0FF; CS8880 = 1; CLK8880 = 1; } void Init8880(void) /***************************************************************************************??????void Init8880(void) ????????????MT8880 ?????? ?????? ?÷???? ?¨???? ****************************************************************************************{ MT8880DATA = 0; Wt8880Cr(MT8880DATA); // Delay(50,100); //???± Cl8880(); MT8880DATA = TOUT + MC*2 + IRQ *4 +RS * 8; Wt8880Cr(MT8880DATA); // Delay(50,100); //???± Cl8880(); MT8880DATA = BURST + TEST*2 + S_C *4 +C_R * 8; Wt8880Cr(MT8880DATA); // Delay(50,100); //???± Cl8880(); }
/**************************************************************************************/
Q?????????°?ú??×??????÷???? ???????????÷?????°?ú?????ú?????ú×??????????÷?ó???é?????????????ù?????????ú???????ú??????
A1???????????? ?????????°???ú?±??5V×ó???????ú?±??????40-60V°????????????·?????????????ò??±í????????????·?±?°??????°?????????÷?????????á??°?????????????
A2???¨?é???÷??±????°???í·??????é???? ???°???°???÷???±?¨30mA×ó?????????????ú?±??????48V?????±???÷??????°????????ú?ó???ò???°?????§?±?÷×è????300?·×ó???¨???????°?????ù?????????ú??????10?à·ü?????????°??·????ú???????ì????
A3???ú±ê ???ú??????48V?ò60V,?????ú?á???????÷??18~80mA.
A4??60V±ê×?????????????????????×??á?????°??????±ê×???
A5???????????ú???ì?????÷?????ì???????? A6??????
/**************************************************************************************/
Q??????MT8880?????? ???°???????????????????????????±?ò???? ??????8??????????????????1.3khz×ó??????????750ma???????¨?? ???????°???ó???????????°?????????ù?? ???????????ù???é????
A1????????×??¤?? ??????????????·??ú??±????ò??????
A2???????????é°????????é8880?????????ù???é?? ?????¨?÷???????????????????í???? ????°??????????????????ù???é??????
/**************************************************************************************/





/**************************************************************************************/
Q??MT8870?????????????? ??°????????????????????·?????????ú?????????????????????????? ?????????ò?¨???????·?ó???????????????????·?????????°?ó??±????????????????????????????????ó??????????????????????·??????°??????????????????????????
A1???????°?????????°?? ???????????????????ú?? ?????????à?à?????????????? ?????ú???±?ò?????????????????¨????°????????·????
A2?????????·?????°???????ú?±
A3?????°?????????? ?????????·?????????°?ó??±????????????????????????????¨?ó??????????????????????
A4?????????·?????????°?ú?????????°?ú???????????ú×????????°?ò???????ò???????????????°?ú???????????????°?ú???ú×????????????¤×÷?? ??????????????±??????·???????????????ù??????????????????????×????????????¨?? ?????·?§?°????????????????
A5?????????ú???·???????????????÷???????ú?????????????????????????÷????±??????°???? ?????????·??°????????????ó???????????????ó??????????
A6??MT8870??????????·????±??????????±????·?±??????????×è????????????????????????????????????????°ì·¨???????????¨??????????????????????1K×ó??????×è??
A7????????????????????????????120?·????×è????????????????×è????????
A8????????±????à?à?????????????? ?????°?±?????????????????????¨???ù?????????? ?¨?é????????×?????20??30mA?????÷???ú?????§??×????? ??680??1K????×è?ú?????§????????
/**************************************************************************************/
Q?????ù?ì??????·????ú,??MT8880??????????????????????????
A1??????5??????????·??¨?????????ú
/**************************************************************************************/
Q??DTMF?????°???·?????? ?÷???ó??,????DTMF?????°???·?????????·??,???????°????DTMF?????????????????÷????????????,???????????±???¨,???÷????????????,?¨?????÷????DTMF?????????ê???????????????????,?????÷?????±,????·?????·?,????????????,?????ó???????????
A1?????????????÷????·???AB??·??????ò??AB??????48·ü??????DTMF??????????????·?????????DTMF??????????
A2?????????÷?????????¨??±????÷??????????????????
A3?????°?????????????????÷?????÷??????????×è???? ?ù?????÷?????????????????????°?ì???±????????±????÷???????????????????¨????±????÷???ù???????????????°???????·
A4???????á??? ???÷????????????,?÷?????÷??????????×è?????á?????????????°?ì,?ó??????????????????????
/**************************************************************************************/
Q???÷??????MT8888?????°?????ù???????????? ????1????DTMF?ì????·??????·?????ó????????????·???
A1?????????????·???¤×÷???????????????ú???·??
A2?????????ú?????·???í???????????????????????·
A3??DTMF??????????????????????×????? 1??8888?????????±??·??ò?°?ì??·??¤×÷???? 2????·????à??????????????1/2Vcc??
A4???????????????????????????????°?????è???í????????????±????÷????????????
A5????????????·??????°???··????? ±????÷????????·????????????????ú????????????±???????
A6??????MT8888?????°?????? 1??????????????·??ó????????·??ò?§?????? 2????????·???×???????????????????????????????·?·??ó???·?? 3??????±????÷?±??×???·?????±?????
/**************************************************************************************/
Q??DTMF ?????????????? ?ó??°??????????????·????????°? ·???DTMF ?????±??????????????±????÷°? ???????±?????????÷???????¨??2?? http://www.21icsearch.com/buzi/upimage/upfile/20045101027100.pdf
A1???????????÷????,??±????ú×????§?????ó ??°?????????·??ó?ó??????????. 1???·???????í,???????????÷??????LED×????????????ü??·?,?ò???????????÷ ??VCC=5,??LED?????á?ú?ú1.5??????,?????????÷?¤×÷????3.5V??,???? LS1240????????,?????????ì????°?,???·????????,?????ê??????????????IC??. ????????·???,????????????·??à??°?,???ù×?????·?
A2?????? ?????? ???????? TONE??????????????·??ó??±???LM386?ò????????·??ó???????????????????????°????????????????????????±?????·??ó?? ???÷?? ???ó???÷??·??ò?????¨?? ?????÷?? ?????????÷???????????????????é·????????? ??
A3?????????????? ???§?????ò??·??????????????·?¨??????????±?????±??? ?í?????°???????±?÷???÷???????????????·???????????á???°?ì???????????°???÷?±?????í?à???§???????ú??????×??????í??????????????????×??????????±?÷·??????????÷?????????????¨?????ó??1.4V?¨?????????????????????????????????÷????????°???
A4?? ?÷°×?? ?±?÷·??????????????¨?ó ???????????????÷·????????????¨??×è?? ???????????????á???????·????
/**************************************************************************************/
Q??MT8888C???§????????????°ì?? ????????3.579M???§???? 8888???§????????VDD??VSS?¨??????°ü°????????§??????6??7???????á????????????2.3V×ó???????????????¨???? 8888???§??????n?????????ù ???ó????????????
A4??1????CS??2??8888???????? ???????÷????????????????
/**************************************************************************************/
Q????????????????Mt8888?????? ?????????§???????ó????mt8888(cm8888)?????????????????????????·????°??????????á???????????????????? ??????×??è???????? °??????á???è???????ó?????ó100ms?????????ó??????????CRA ???¨1 1 0 1 ,b3???°???? DTMF,in/Out ,IRQ, CRB???¨0 0 0 0 ?? Burst, ??????????????poll·?????????????×????????÷?? ???ó?????????÷??·???????????????ToneOut??????????????????×????????÷??·???????b1????????1?????ó??°??????°?ú????°??ü??·???×????????÷??b2??????????1??b0?????????ù????????·?????·??????????????ú????????±????????????? ????IRQ????·???????????°??üIRQ??????????200???????????????ó????????????°??üIRQ?ò±?????×???????????????°??ü?????????????????????????? ?????????????????????? ???????????????÷???????¨150ms??????·?????????????toneout??????????????????·??????????????????à?????? ?????? no burst mode.?÷??·??????????????¨??????CRA?? b0?????????????????????????±?????¤?ò?????? ?????÷???ó????°??ù???????????????????????? ?±???????????à???ó???è?????????ù???????????ù???ó??????????????Thanks in advanced!
A1??????????????? ?????ú??????,?ù????????????,???±????????????1???ó,????????; ?í??,?????????°,????????MT8880???????????
/**************************************************************************************/
Q??????????????MT8870??????????????????????????±? ?ò?è?????????????°?????à??DTMF??????×°?????é??MT8870??×???·?????????????????????????????2????·¨????????????????????·¨????±????????·??????????????±????ì?¤MT8870??????????????????????????????????
A1??????????·?·¨·??°?????±???°?????±???? ???????·?ò??????????????????°?°??????·???ù???????????????????????????????????????????????à·??????·????×é?????÷???????¤????????????MT8870??IC??DTMF????????????·??????????à??·??à????????????×????????????°?????±???°?????±?????????????????????????????????? ??°????????·?ù??????????????????±????÷?±????????????????????·¨?? A2????????????????????·¨???????????????????é?????????????????????????????ú?????·???????ò???·???????????????????????????é????????????7??8??9?????????????????ù???????????????????????????????ü?ü?????????? ?í???????ú?????ú???·???????????????????????±???ú???????????ú???????????????·???????????????????ú?????·???????±??????????RS485×????÷?±?????????±?ò????±????????à?????ì????????????????????????·????÷?????·????????485???????????ú?????÷×???!
/**************************************************************************************/
Q?????????°????MT8880?????????????·???????????? ?????????????÷?????·?????????????à?ì?????????§??????????????·??????????????????????ù??????×??????????????????? ?÷?????????????????ú????????????????·??ú???÷???????????????°????????X1 X2???????????±?÷63V×ó??(?????ù??·???·??????????°?ì°?????)?±???????????±????????X1X2????????90V?¨????????25Hz90V???????????????í??????°?×??????????¨?÷??????·??????????ó?????????????ò?? ????????°?×??????????????±?±?????ò??±í?????????????¨??????DTMF?????????±????1.7V×ó???????±?????¨?÷??????×???????????°?×??????????????ó??????×??ò??±í???±??40V×ó???????ù?????????????¨?÷??????????????????????DTMF???ò???¨?÷?????¨???ü?????????¨??50Hz??·ù??115V×ó?????ó???¨?????¨?????ú?????÷?????????????????ù???¨?????±???±?????ò??±í????DTMF??????3.6V×ó???? ???????×?????????ó???????? ?í???????????°?????????ú?????÷???????????????ú?ó????????°??????°?ú?????????ü?????????¨?÷??DTMF???????¨?÷???????¨??????±????????????????????????????????? ?????à???????·???ó???????????????????????????????÷?ù?ò???????????????? ?¨????4??
A1????×???????DTMF????????????????MT8888??????????????????????????????????DTMF?????????????? ?????°?í??????°?×??????????¨?÷??????·??????????ó?????????????ò?±?????¨?÷?????????????????????????°?????±???????????????????????????????ó??????±????÷???????ó????±????÷???í??2?????????±??????????????
A2???????????????????????·?? 1?????????ú???·×?????????????×è???ò????×è?????????????ü?????ó?? ?¨?é????20mA?????÷???ú???? 2?????????ú???·??·???·??ò?????????ó???????ù???????ú?ó???????? ??????×è?????¨×??????????????????±?????????ò?????÷???????? ×è×?????×è????DTMF??????????
A3??°????á???????¨?é?????????????¨??5??
A4??°????????????¨?????? ???????¨??1?? ?????ù?????ù?? ????°?×????????????±?????¨?÷?????????????¨??????DTMF?????????±???ò???¨?÷?????¨???ü?? ???????¨??50Hz??·ù??115V×ó?????ó???¨?????¨?????ú?????÷?????????????????ù???¨???? ?í???????????°?????????ú?????÷???????????????ú?ó????????°??????°?ú?????????ü?????????¨ ?÷??DTMF???????¨?÷???????¨??????±????? ???????ú?ú??????
A5?????????? ?????¨?÷?????¨???ü?????????¨??50Hz??·ù??115V×ó???? ?????¨?÷?????ó???ì??????
A6?????????????¨???¨??6?? ?°?????¨?÷?????¨???ü?????????¨??50Hz??·ù??115V×ó???? ?????¨?÷?????ó???ì???????± ????mascotlou?ù??????????????????????°??????ù???¨???????? ??????100V??????×è?????????¨?÷?????????????¨??????6 ?????·???¨?????????????ù×?°??????? ????????????·?·¨??????
A7??DTMF??????????·??????????????? ?????????ù?±??????????×è???×??????8050???????·???×??????????·??ó×÷??????×????????¨?÷????????
A8??????????±????÷ ????????????DTMF????. ????????±????÷?????????????????ê?????????????°?ú?????????????ê?÷???????????????????ù????????????????????????????????????????±????÷????????????????????·???°????????????????? ?±??????·????????????¨??????????5V???í??????0.1u?????°??×è??MT8880???????????á???????·?? ???ù×???????
A9???????????·??DTMF??????????????????±????÷ ??????????8????????????°??ú??liu-yanxu@163.com
A10???????????×???????? ??????????·?DTMF?????¨??????????±????÷?????ü???????ù??×÷?????? ?????????????????????·?????ù???±???????? ?? ?¨????????????????·??????è?????????????·?í????????????????????????????????
A11???????????ù ??×?????DTMF???¨????????±????÷?????????????????????°?????????ó??????????????×÷?±????????
A12??????????????????????·????????ó ????????????????????????????????????±????÷??????????
A13???????????é???????ú?ó????X1 X2???????????à?? ???ì?????÷?????±??°??????ü????MT8880??Est??St/GT???????????????????????????????ù?????ó???????÷MT8880???????????????????????????????????òMT8880??IN-????????????DTMF?????¨???????ò?????????????? ?????????¨?÷???????????????¨Fluke?????????????????¨?÷???í???????ò???????ú?ó????X1 X2??????????6V???????????ó??5V???????????????????ú???????????????????????????????????é????????????????·?±????à??? ???·???????????ù????????????

[ ±???×??ó?? zing ?? 2006-7-21 17:35 ±à?? ]

---

作者: jseen    时间: 2007-2-4 02:04

?ó????.????MT8888??????????????????????,?????????????????????????????????????±???÷??°??ú???????¤????.QQ:27349001.E-mail:Jseen1@21cn.com

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作者: zing    时间: 2007-2-5 11:15

?????????????·?????ù??????

---

作者: craneshj    时间: 2007-4-19 12:45     标题: mt8880°?

?÷???ó???ó??°?°???°?~~??×??ü??×???mt8880??89c52?????ú????×é???????°???????????é
  ????MT8880????·??????????????????????????ì????MT8880?????±??IRQ/CP???????????¨??
    ??????·????????±???????ú??????????P0???¨??????P0????MT8880??D0~D3?°R/W??RS0??CLK??CS??
   ???????¨?÷????·??????¨??±?????MT8880??TONE???????¨??±???????????????????????????????
   ???????ò??????
      ORG    0000H
      LCALL  MAIN
     ORG    100H
       MAIN??       MOV 40H,#01H
                           MOV 41H,#02H
                           MOV 42H,#03H
                           MOV 43H,#04H
                           MOV 44H,#05H
                           MOV 45H,#06H
                           MOV 46H,#07H
  SEND:   MOV    R0,    #40H           ;·????÷???ò
        MOV    R1,    #07H
        CLR    CS   
        CLR    CLK
        CLR    RW
        SETB   RS
        MOV    A,#1DH
        MOV    P0,    A                ; ?? 8880CRA
        SETB   CLK
        NOP
        NOP
        CLR CLK
        MOV A,#10H
        MOV P0,A                       ;??8880CRB
        SETB CLK
        NOP
        NOP
        CLR CLK
        SETB   CS
       CLR  CS
       CLR CLK
       CLR RS
       CLR RW
LOOP2:  MOV    A,    @R0
        MOV P0,A
        SETB CLK
        NOP
        NOP
        CLR  CLK
        MOV R2,#05H
        LCALL DELL1
        INC R0
LOOP3:  DJNZ R1,LOOP2
        SJMP    SEND
DELL1 :MOV R3,#0C8H
DELL2 :MOV R4,#0FAH
DELL3 JNZ R4,DELL3
       DJNZ R3,DELL2
       DJNZ R2,DELL1
       RET
       END
  ???á????????×???  ?????????ò??????????
   ??????????????????????×????±??????·?·¨?????ì???????????é??×????????÷??·?·¨
    ??????????1.?????????????÷?±??RS0??????????1?????????????????????±????±???RS0??1???????±?ò???????ù????
                        2.?±????????·?????CLK???±??????????????°?????????P0???ó??????CLK?¨???????ò???????ù??
     ??????CLR CLK??SETBCLK??CLR CLK ???ó??????????P0??????
                        3.???????????ú??P0????×÷???????????±??????????×è°??????ò??????P0????4???????????????????ù??????
             ????????????????????°??ú?????????????÷??3??°?????±????è??×????????à???????ü???????ò??·???????????????°?????????????????????????????
   ????????????crane.s@163.com

---

作者: zha0530    时间: 2007-5-12 11:49     标题: ?????ó????MT8880??????×????

???????????¤?±????×???,????????????MT8880??????×???
?????ó????°???????
??????????zha0530@163.com

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作者: zing    时间: 2007-5-12 20:49

????????????????????????????·????í???¨?ú????°???

---

作者: zha0530    时间: 2007-5-14 20:22

??????,????????????,?????????????ú°???

---

作者: zha0530    时间: 2007-5-15 23:14

---

作者: zha0530    时间: 2007-5-15 23:15

????????,????????????,???à°?

---

作者: zha0530    时间: 2007-5-18 16:25     标题: zing

????°?
     ??????????·?±í??????????,???í°?

---

作者: zha0530    时间: 2007-5-18 16:28     标题: zing

zing:
?????????????§×??????????????°?????????????¨?é??
????±??????????????±?ò??·???????
??????????????±???×???????·?????

---

作者: zing    时间: 2007-5-19 09:22

????8880,?????????????????????è??×?????????????????°??????????????·??°???????
?????????????°???·×??????????????????????????????è????·?????????±?????

---

作者: zha0530    时间: 2007-5-19 11:45     标题: zing

??????:
     ??????????°?????,2262??315M???¨??;
     ???????????à????×?,
     ?????????¤×÷??°?·????é????????????ó??????
     ????QQ:307042537
     zha0530@163.com

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作者: zing    时间: 2007-5-22 11:32

????msn,????·???°?

---

作者: zha0530    时间: 2007-5-25 00:08     标题: msn

msn:
     zhanghaian520@hotmail.com

---

作者: zing    时间: 2007-5-25 13:02

msn  zano(at)163??net

---

作者: zha0530    时间: 2007-6-2 21:19     标题: zing

?????????????????????.
?±?????¨?ê???°,????×???CP(????????)????????
IRQ/CP????INT1??,????????????????(?????×???????ú?ú)
???????????????????,?????????ì??,

---

作者: zha0530    时间: 2007-6-2 21:33     标题: zing

zing


?????????????????????.
?±?????¨?ê???°,????×???CP(????????)????????
IRQ/CP????INT1??,????????????????(?????×???????ú?ú)
???????????????????,?????????ì??,

---

作者: zing    时间: 2007-6-4 11:44

???¤??????????±????????????????÷,??????CRA.b2,×????????????????·?????ú??,???ù????±????ì?¨??....?ò?????ò???é?????????·?????ò?÷??

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