KEY4:MOV 34H, #01
AJMP K5
KEY5:MOV 35H, #01
AJMP K6
KEY6:MOV 36H, #01
AJMP K7
KEY7:MOV 37H, #01
MOV A, #00H
MOV A, 34H
ADD A, 35H
ADD A, 36H
ADD A, 37H ;减数放A
CLR C ;清C(比较)
SUBB A,R4 ;A-R4
JC JIA ;A <0则跳JIA
MOV 21H, A ;交换
MOV A, #10
SUBB A, 21H
AJMP JG
JIA: MOV 20H, A
MOV A, R4
MOV R4, 20H
SUBB A, R4
JG: MOV R5, A ;结果放R5
GOJMP:AJMP KEY
DELAY: MOV R7,#200 ;10ms延时子程序
D1: MOV R6,#123
NOP
D2: DJNZ R6,D2
DJNZ R7,d1
RET
END
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