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1、串口編程1、串行口方式1應(yīng)用編程補(bǔ)充例1本例采用方式1進(jìn)行雙機(jī)通信，收發(fā)雙方均采用6MHz晶振，波特率為2400，每一幀信息為10位，第0位為起始位，1～8位為數(shù)據(jù)位，最后1位為停止位。發(fā)送方將78H、77H單元的內(nèi)容為首地址，以76H、75H單元內(nèi)容減1為末地址的數(shù)據(jù)塊內(nèi)容通過串行口發(fā)送給接收方。發(fā)送方要發(fā)送的數(shù)據(jù)塊的地址為2000H～201FH。發(fā)送時(shí)先發(fā)送地址幀，再發(fā)送數(shù)據(jù)幀；接收方在接收時(shí)，使用一個(gè)標(biāo)志位來區(qū)分接收的數(shù)據(jù)是地址還是數(shù)據(jù)，然后將其分別存放在指定的單元中。發(fā)送方可采用查詢方式或中斷方式發(fā)送數(shù)據(jù)，接收方采用中斷或查詢方式接收。本例子僅給出中斷方式的發(fā)送和接收的程
2、序。1）甲機(jī)發(fā)送程序中斷方式的發(fā)送程序如下：ORG0000HLJMPMAINORG0023HLJMPCOM_INTORG1000HMAIN:MOVSP,#53H；setstocktoppointerMOV78H,#20H；setsendingdatafirst-bottomaddressMOV77H,#00HMOV76H,#20HMOV75H,#40HACALLTRANS；callsendprogSJMP$TRANS:MOVTMOD,#20H；settimer/counterworkingmodelMOVTH1,#0F3H；setcounterinitialvalueMOVTL1
3、,#0F3HMOVPCON,#80H；setbaudratedoubleSETBTR1；opencounterMOVSCON,#40H；setserialworkingmodelMOVIE,#00H；Firstcloseinterrupt，usequerymodelsendingaddressCLRF0MOVSBUF,78H；sendfirst-addresshigh8bitWAIT1:JNBTI,WAIT1CLRTIMOVSBUF,77H；sendfirst-addresslow8bitWAIT2:JNBTI,WAIT2CLRTIMOVSBUF,76H；sendend-addr
4、esshigh8bitWAIT3:JNBTI,WAIT3CLRTIMOVSBUF,75H；sendend-addresslow8bitWAIT4:JNBTI,WAIT4CLRTIMOVIE,#90H；openinterrupt，interruptmodelsenddataMOVDPH,78HMOVDPL,77HMOVXA,@DPTRMOVSBUF,A；sendfirstdataWAIT:JNBF0,WAIT；waitsendingRETCOM_INT:CLRTI；closesending-interruptflagbitTIINCDPTR；datapointeradd1，inte
5、ndsendingnextdataMOVA,DPH；determinecurrentsendingdataaddresswetherornotbottomaddressCJNEA,76H,END1；nobottomaddress，jumpMOVA,DPLCJNEA,75H,END1SETBF0；datasendingend，setF0equ1CLRES；closeserialinterruptCLREA；closeinterruptRETEND1:MOVXA,@DPTR；waitsendingdatagiveA，intendtosendMOVSBUF,A；senddataRETI
6、END2）乙機(jī)接收程序中斷方式的接收程序如下：ORG0000HLJMPMAINORG0023HLJMPCOM_INTORG1000HMAIN:MOVSP,#53H；setstocktoppointerACALLRECEISJMP$RECEI:MOVR0,#78HMOVTMOD,#20HMOVTH1,#0F3H；setcounterinitialvalueMOVTL1,#0F3HMOVPCON,#80H；setbaudratedoubleSETBTR1；opencounterMOVSCON,#50H；setserialworkingmodelMOVIE,#90H；openinter
7、ruptCLRF0；clearflagF0CLR7FHWAIT:JNB7F,WAIT；queryflag-bit，waitreceivedataRETCOM_INT:PUSHDPL；保護(hù)現(xiàn)場(chǎng)PUSHDPHPUSHACCCLRRI；清接收中斷RIJBF0,R_DATA；判斷接收的是數(shù)據(jù)還是地址，F(xiàn)0＝0為地址MOVA,SBUF；接收數(shù)據(jù)MOV@R0,A；將地址幀送指定的寄存器DECR0CJNER0,#74H,RETNSETBF0；置標(biāo)志位，地址接收完畢RETN:POPACC；出棧P
