MOV SCON,#50H SETB PS
MOV IE,#92H SETB TR1 SETB TR0 SLED:
MOV R0,#30H MOV R1,#20H LJMP LED CLOCK:
MOV TH0,#3CH MOV TL0,#0B0H DJNZ 50H,RETURN MOV 50H,#14H
MOV A,#01H ADD A,32H DA A MOV 32H,A
CJNE A,#60H,RETURN MOV 32H,#00H
MOV A,#01H
ADD A,31H DA A MOV 31H,A
CJNE A,#60H,RETURN MOV 31H,#00H
MOV A,#01H ADD A,30H DA A MOV 30H,A
CJNE A,#24H,RETURN MOV 30H,#00H RETURN: RETI LED:
MOV A,@R0 SWAP A ANL A,#0FH ACALL CTAB MOV R2,A
MOV A,@R0 ANL A,#0FH LCALL CTAB
MOV R3,A
MOV DPTR,#8002H MOV A,R1 MOVX @DPTR,A MOV DPTR,#8004H MOV A,R2 MOVX @DPTR,A MOV A,R1 RR A MOV R1,A LCALL DLY
MOV DPTR,#8002H MOV A,R1 MOVX @DPTR,A MOV DPTR,#8004H MOV A,R3 MOVX @DPTR,A MOV A,R1 RR A MOV R1,A LCALL DLY
INC R0
CJNE R0,#33H,LED LJMP SLED
CTAB: PUSH DPH PUSH DPL MOV DPTR,#TAB MOVC A,@A+DPTR POP DPL POP DPH RET INPUT:
CLR RI CLR EA MOV 30H,SBUF JNB RI,$ CLR RI MOV 31H,SBUF JNB RI,$ CLR RI MOV 32H,SBUF SETB EA RETI TAB:
DB
3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
DLY:
MOV R7,#02H DL:
MOV R6,#0FFH DL1:
DJNZ R6,DL1 DJNZ R7,DL RET END
51单片机实验及代码
