查询1.asm

我学单片机89C51时编的大部分程序都在里面

ORG 0000H
AJMP START
ORG 0030H
START:MOV TMOD,#10H
MOV R0,#0AH
MOV R1,#08H
MOV R2,#08H
MOV R3,#01H
CLR A
SETB ET1
SETB EA
LOOP:MOV TH1,#3CH    ;LOOP计数50ms
MOV TL1,#0B0H
SETB TR1
JNB TF1,$      ;T1没有溢出等待

CLR TF1
DJNZ R0,LOOP
CJNE R1,#00H,MOD1
CJNE R2,#00H,MOD2
CJNE R3,#00H,MOD3
LJMP MOD4

MOD1: SETB CY
RLC A
MOV P1,A
MOV R0,#0AH
DEC R1
LJMP LOOP

MOD2: CLR CY
RRC A
MOV P1,A
MOV R0,#0AH
DEC R2
LJMP LOOP

MOD3:MOV A,#0FFH
MOV P1,A
MOV R0,#0AH
DEC R3
LJMP LOOP

MOD4:CLR A
MOV P1,A
MOV R1,#08H
MOV R2,#08H
MOV R3,#01H
MOV R0,#0AH
LJMP LOOP