中南大学单片机实验报告(3)

MOV P1,R3 MOV A,P1

LOOP1: KEY2:

CPL A

ANL A,#0FH

JNZ KEY2 MOV A,R3 RR A

MOV R3,A

DJNZ R4,LOOP1 SJMP EXIT DEC R4

CJNE R2,#01H,LOOP3 MOV A,#01H

SJMP LOOP6

LOOP3: CJNE R2,#02H,LOOP4 LOOP4:

MOV A,#04H SJMP LOOP6

CJNE R2,#04H,LOOP5

MOV A,#07H SJMP LOOP6

LOOP5: CJNE R2,#08H,LOOP6 MOV A,#0AH LOOP6: ADD A,R4 MOV R5,A

MOV P1,#0FH

;MOV A,R6 EXIT: RETI

;延时后再次扫描有无按键按下

SCAN: MOV P1,#0FH MOV A,P1 CPL A

ANL A,#0FH