给初学单片机的40个实验-2(4)

ANL A,#0FH XRL A,#0FH JZ NOKEY1 MOV A,P3 ANL A,#0FH

CJNE A,#0EH,NK1 MOV KEYBUF,#0 LJMP DK1

NK1: CJNE A,#0DH,NK2 MOV KEYBUF,#1 LJMP DK1

NK2: CJNE A,#0BH,NK3 MOV KEYBUF,#2 LJMP DK1

NK3: CJNE A,#07H,NK4 MOV KEYBUF,#3 LJMP DK1 NK4: NOP DK1:

MOV A,KEYBUF MOV DPTR,#TABLE MOVC A,@A+DPTR MOV P0,A

DK1A: MOV A,P3 ANL A,#0FH XRL A,#0FH JNZ DK1A NOKEY1:

MOV P3,#0FFH CLR P3.5 MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY2

LCALL DELY10MS MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY2 MOV A,P3 ANL A,#0FH

CJNE A,#0EH,NK5 MOV KEYBUF,#4

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