?? 查詢式鍵盤設計.asm
字號:
ORG 00H
MOV P3,#0FFH
MOV P2,#00H
KEY: MOV A,P3
CJNE A,#0FFH,KK ;是否有鍵按下?
AJMP KEY
KK: MOV A,P3
CJNE A,#0FFH,KK1 ;消除按鍵抖動
AJMP KEY
KK1: CJNE A,#0FEH,KK2
MOV P2,#06H
LCALL DELAY
AJMP LP
KK2: CJNE A,#0FDH,KK3
MOV P2,#5BH
LCALL DELAY
AJMP LP
KK3: CJNE A,#0FBH,KK4
MOV P2,#4FH
LCALL DELAY
AJMP LP
KK4: CJNE A,#0F7H,KK5
MOV P2,#66H
LCALL DELAY
AJMP LP
KK5: CJNE A,#0EFH,KK6
MOV P2,#6DH
LCALL DELAY
AJMP LP
KK6: CJNE A,#0DFH,KK7
MOV P2,#7DH
LCALL DELAY
AJMP LP
KK7: CJNE A,#0BFH,KK8
MOV P2,#07H
LCALL DELAY
AJMP LP
KK8: CJNE A,#7FH,LP
MOV P2,#7FH
LCALL DELAY
LP: AJMP KEY
DELAY:MOV R7,#01H
DELA: MOV R6,#28H
DEL: MOV R5,#5AH
DJNZ R5,$
DJNZ R6,DEL
DJNZ R7,DELA
RET
END
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