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i have problem interfacing lcd and keypad with 89s52 Microcontroller

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saaiim

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i have problem interfacing lcd and keypad with 89s52 Microcontroller
it display 1234567 but not displaying ABCD
my progam is: help me plz its an urgent

Code:
 rs equ P3.5
	   rw equ P3.4
	   en equ P3.3   
           ORG 00H
    BACK:    MOV R7,#0H
             MOV A,#38H
             ACALL COMNWRT
             ACALL DELAY1
             MOV A ,#0EH
             ACALL COMNWRT
             ACALL DELAY1
             MOV A,#01
             ACALL COMNWRT
             ACALL DELAY1
             MOV A,#06
             ACALL COMNWRT
             ACALL DELAY1
             MOV A,#80H
             ACALL COMNWRT
             ACALL DELAY1 
            MOV P2,#0FFH
     K1:    MOV P0,#0H
           	MOV A,P2
           	ANL A,#00001111B
           	CJNE A,#00001111B,K1
           	 
     K2:	ACALL DELAY
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,OVER
            
            SJMP K2
    OVER:   ACALL DELAY
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,OVER1
            
            SJMP K2
    OVER1:  MOV P0,#11111110B
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,ROW_0
            MOV P0,#11111101B
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,ROW_1
            MOV P0,#11111011B
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,ROW_2
            MOV P0,#11110111B
            MOV A,P2
            ANL A,#00001111B
            CJNE A,#00001111B,ROW_3
           
            LJMP K2
    ROW_0:  MOV DPTR,#KCODE0
            SJMP FIND
    ROW_1:  MOV DPTR,#KCODE1
            SJMP FIND
    ROW_2:  MOV DPTR,#KCODE2
            SJMP FIND
    ROW_3:  MOV DPTR,#KCODE3
            SJMP FIND 
    FIND:    
            RRC A
            JNC MATCH
            INC DPTR
            SJMP FIND
     MATCH: CLR A
            MOVC A,@A+DPTR
            MOV P1,A
            CALL DATA1
            INC R7
            CJNE R7,#0FH,K1
            MOV A,#01H
             ACALL COMNWRT
             ACALL DELAY1  
            LJMP BACK
    DELAY:  
            MOV R3,#255
    HERE2:  MOV R4,#120
    HERE:   DJNZ R4,HERE
            DJNZ R3,HERE2
            RET
   DELAY1:  
             MOV R3,#255
    HERE1:   DJNZ R3,HERE1
             RET          
   COMNWRT: 
             MOV P1,A   
             CLR P3.5
             CLR P3.4
             SETB P3.3
             ACALL DELAY
             CLR P3.3
             RET 
   DATA1:       
             SETB P3.5
             CLR P3.4
             SETB P3.3
             ACALL DELAY
             CLR P3.3
             RET
     KCODE0: DB '1','2','3','A'
     KCODE1: DB '4','5','6','B'
     KCODE2: DB '7','8','9','C'
     KCODE3: DB '*','0','#','D'
	 END
 
Last edited by a moderator:

KlausST

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Hi,

You did not show circuit diagram.
are you sure it is the code?

What happens to: '*','0','#','D' ?

Klaus
 

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