單片機(jī)課程設(shè)計(jì)---基于單片機(jī)的數(shù)字電壓表設(shè)計(jì)(存儲版)
【正文】 SJMP WLP1 WR0: CLR SDA 。指定子地址 LCALL WRBYTE LCALL CACK MOV R1,MTD WRDA: MOV A,R1 LCALL WRBYTE 。發(fā)送器件從地址 LCALL CACK JNB ACK,RETWRN 。取數(shù)據(jù)位 JC WR1 SJMP WR0 。結(jié)束總線 NOP 。讀 /寫的字節(jié)數(shù)變量 ORG 00H SJMP MAIN ORG 00BH LJMP INT_T0 ORG 0003H LJMP INT_EX0 ORG 030H MAIN: MOV SP,70H MOV R2,08H MOV TMOD, 01H MOV TL0, 0B0H MOV TH0, 3CH SETB EX0 SETB IT0 SETB ET0 SETB EA SETB TR0 MOV 66H,0 MOV 67H,0 MOV 68H,0 MOV 69H,0 MOV 6AH,0 MOV 6BH,0 《單片機(jī)原理及應(yīng)用》課程設(shè)計(jì) 第 15 頁 共 22 頁 MOV 6CH,0 MOV 6DH,0 MOV R1,30H MOV R7,20 SJMP $ INT_T0: MOV TL0, 0B0H MOV TH0, 3CH MOV DPTR,0000H MOVX DPTR,A MOV R0,30H MOV A,R1 MOV B,5 DIV AB MOV B,10 DIV AB MOV 66H,B MOV B,10 DIV AB MOV 67H,B ORL 67H,80H MOV 68H,A MOV 6DH,R1 ANL 6DH,07H LCALL LEDDISP DJNZ R7,T0_END MOV R7,20 INC R1 CJNE R1,38H,T0_END MOV R1,30H T0_END: RETI INT_EX0:MOVX A,DPTR MOV R0,A INC DPTR INC R0 CJNE R0,38H,LOP RETI LOP: MOVX DPTR,A RETI 《單片機(jī)原理及應(yīng)用》課程設(shè)計(jì) 第 16 頁 共 22 頁 leddisp:push psw push acc setb rs1 setb rs0 mov r0,66H mov r4,8 mov r5,60h loop: MOV MTD,R5 MOV MTD+1,R0 MOV SLA,70H MOV SUBA,07H MOV NUMBYTE,02H LCALL IWRNBYTE LCALL DELY1 INC R0 INC R5 DJNZ R4,LOOP POP ACC POP PSW RET re7290: clr rst lcall dely setb rst lcall dely ret dely :mov r7,80H min :djnz r7,ys500 ret ys500 :lcall ys500us ljmp min ys500us:mov r6,80h djnz r6,$ ret dely1 :mov r7,40h
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鄂ICP備17016276號-1