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后知后覺(jué)。。新蟲(chóng) (初入文壇)
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[求助]
單片機(jī)設(shè)計(jì)的秒表計(jì)時(shí)器不能正常顯示是什么情況,求助,在線等
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程序如下SECOND EQU 30H TCOUNT EQU 31H KCOUNT EQU 32H KEY BIT P3.7 ORG 00H SJMP START ORG 0BH LJMP INT_T0 START: MOV DPTR,#TABLE MOV P0,#3FH MOV P2,#3FH MOV SECOND,#00H MOV TCOUNT,#00H MOV KCOUNT,#00H MOV TMOD,#01H MOV TL0,#(65536-50000)/256 MOV TH0,#(65536-50000)/256 K1: JB KEY,$ LCALL DELAY JB KEY,$ MOV A,KCOUNT CJNE A,#00H,K2 SETB TR0 MOV IE,#82H JNB KEY,$ INC KCOUNT LJMP K1 K2: CJNE A,#01H,K3 CLR TR0 MOV IE,#00H JNB KEY,$ INC KCOUNT LJMP K1 K3: CJNE A,#02H,K1 JNB KEY,$ LJMP START INT_T0: MOV TH0,#(65536-50000)/256 MOV TL0,#(65536-50000)/256 INC TCOUNT MOV A,TCOUNT CJNE A,#2,I2 MOV TCOUNT,#00H INC SECOND MOV A,SECOND CJNE A,#100,I1 MOV SECOND,#00H I1: MOV A,SECOND MOV B,#10 DIV AB I3: CJNE A,#6,I4 CJNE A,#7,I4 CJNE A,#8,I4 CJNE A,#9,I4 I4: CLR A MOVC A,@A+DPTR MOV A,B MOV P0,A MOVC A,@A+DPTR MOV P2,A I2: RETI TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH DELAY: MOV R6,#20 D1: MOV R7,#250 DJNZ R7,$ DJNZ R6,D1 RET END |
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