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13例常用仿真电路

KEYBUF    EQU 30H 
            ORG 00H 
START:      MOV KEYBUF,#8 
WAIT:   
            MOV P3,#0FFH 
            CLR P3.4 
            MOV A,P3 
            ANL A,#0FH  
            XRL A,#0FH 
            JZ NOKEY1 
            LCALL DELY10MS 
            MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JZ NOKEY1 
            MOV A,P3 
            ANL A,#0FH 
            CJNE A,#07H,NK0 
            MOV KEYBUF,#0
            LJMP DK1 
NK0:        CJNE A,#0BH,NK1 
            MOV KEYBUF,#1 
            LJMP DK1 
NK1:        CJNE A,#0DH,NK2 
            MOV KEYBUF,#2
            LJMP DK1 
NK2:        CJNE A,#0EH,NK3 
            MOV KEYBUF,#3 
            LJMP DK1 
NK3:        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,#07H,NK4 
            MOV KEYBUF,#4 
            LJMP DK2 
NK4:        CJNE A,#0BH,NK5 
            MOV KEYBUF,#5
            LJMP DK2 
NK5:        CJNE A,#0DH,NK6 
            MOV KEYBUF,#6 
            LJMP DK2 
NK6:        CJNE A,#0EH,NK7
            MOV KEYBUF,#7 
            LJMP DK2 
NK7:        NOP 
DK2:    
            MOV A,KEYBUF 
            MOV DPTR,#TABLE 
            MOVC A,@A+DPTR 
            MOV P0,A 
  
DK2A:       MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JNZ DK2A 
NOKEY2: 
            MOV P3,#0FFH 
            CLR P3.6 
            MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JZ NOKEY3 
            LCALL DELY10MS 
            MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JZ NOKEY3 
            MOV A,P3 
            ANL A,#0FH 
            CJNE A,#07H,NK8 
            MOV KEYBUF,#8 
            LJMP DK3 
NK8:        CJNE A,#0BH,NK9 
            MOV KEYBUF,#9
            LJMP DK3 
NK9:       CJNE A,#0DH,NK10 
            MOV KEYBUF,#10 
            LJMP DK3 
NK10:       CJNE A,#0EH,NK11
            MOV KEYBUF,#11 
            LJMP DK3 
NK11:       NOP 
DK3: 
            MOV A,KEYBUF 
            MOV DPTR,#TABLE 
            MOVC A,@A+DPTR 
            MOV P0,A 
  
DK3A:       MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JNZ DK3A 
NOKEY3: 
            MOV P3,#0FFH 
            CLR P3.7 
            MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JZ NOKEY4 
            LCALL DELY10MS 
            MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JZ NOKEY4 
            MOV A,P3 
            ANL A,#0FH 
            CJNE A,#07H,NK12 
            MOV KEYBUF,#12 
            LJMP DK4 
NK12:       CJNE A,#0BH,NK13 
            MOV KEYBUF,#13 
            LJMP DK4 
NK13:       CJNE A,#0DH,NK14 
            MOV KEYBUF,#14
            LJMP DK4 
NK14:       CJNE A,#0EH,NK15 
            MOV KEYBUF,#15
            LJMP DK4 
NK15:       NOP 
DK4:    
            MOV A,KEYBUF 
            MOV DPTR,#TABLE 
            MOVC A,@A+DPTR 
            MOV P0,A 
  
DK4A:       MOV A,P3 
            ANL A,#0FH 
            XRL A,#0FH 
            JNZ DK4A 
NOKEY4: 
            LJMP WAIT 
DELY10MS: 
            MOV R6,#10 
D1:         MOV R7,#248 
            DJNZ R7,$ 
            DJNZ R6,D1 
            RET 
TABLE:      DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H 
            DB 7FH,6FH,77H,7CH,39H,5EH,79H,71H 
            END