【正文】 CJNE A,3FH,PL0 SJMP LOOP PL0: LCALL DELAY MOV A,P2 CJNE A,3FH,IN0 SJMP LOOP IN0: JNB ,P1F JNB ,P2F JNB ,P3F JNB ,P4F JNB ,P5F JNB ,P6F SJMP ATART P1F: LJMP F1 P2F: LJMP F2 P3F: LJMP F3 P4F: LJMP F4 P5F: LJMP F5 P6F: LJMP F6 F1: MOV P1,0FFH MOV P0,0FFH MOV SCON,0 MOV A,28H MOV SBUF,A JNB T1,$ CLR T1 JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP LJMP START F2: MOV P1,OFFH MOV P0,0FFH 11 MOV SCON,0 MOV A,0CDH MOV SBUF,A JNB T1,$ CLR T1 JNB ,DOWN JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,DOWN JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP LJMP START F3: MOV P1,0FFH MOV P0,0FFH MOV SCON,0 MOV A,6DH MOV SBUF,A JNB T1,$ CLR T1 JNB ,DOWN JNB ,DOWN JNB ,UP JNB ,UP JNB ,UP JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,UP JNB ,UP JNB ,UP JNB ,UP JNB ,UP LJMP START F4: MOV P1,0FFH MOV P0,0FFH MOV SCON,0 MOV A,2BH 12 MOV SBUF,A JNB T1,$ CLR T1 JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,UP JNB ,UP JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,UP JNB ,UP JNB ,UP LJMP START F5: MOV P1,0FFH MOV P0,0FFH MOV SCON,0 MOV A,6BH MOV SBUF,A JNB T1,$ CLR T1 JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,UP JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,UP LJMP START F6: MOV P1,0FFH MOV P0,0FFH MOV SCON,0 MOV A,0E7H MOV SBUF,A JNB T1,$ 13 CLR T1 JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN JNB ,DOWN LJMP START DELAY:PUSH 04H PUSH 05H MOV R5, 7FH DM1: MOV R6, 0FFH DM2: DJNZ R6, DM2 DJNZ R5, DM1 POP 05H POP 04H RET UP: SET C MOV ,C LJMP START DOWN: CLR C MOV ,C LJMP START