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SJMP START
ORG 0030H
START: MOV P0,#0FFH
ACALL LCD_INITIALIZE
K1: MOV P1,#0
MOV A,P0
ANL A,#00001111B
CJNE A,#00001111B,K1
K2: MOV A,P0
ACALL DELAY
ANL A,#00001111B
CJNE A,#00001111B,OVER
SJMP K2
OVER: ACALL DELAY
MOV A,P0
ANL A,#00001111B
CJNE A,#00001111B,OVER1
SJMP K2
OVER1: MOV P1,#1111110B
MOV A,P0
ANL A,#00001111B
CJNE A,#00001111B,ROW_0
MOV P1,#11111101B
MOV A,P0
ANL A,#00001111B
CJNE A,#00001111B,ROW_1
MOV P1,#11111011B
MOV A,P0
ANL A,#00001111B
CJNE A,#00001111B,ROW_2
MOV P1,#11110111B
MOV A,P0
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
FIND: RRC A
JNC MATCH
INC DPTR
SJMP FIND
MATCH: CLR A
MOVC A,@A+DPTR
ACALL LCD_DATA
LJMP K1
LCD INITIALIZE : MOV A,#38H
ACALL LCD_COMMAND
MOV A,#0EH
ACALL LCD_COMMAND
MOV A,#01H
ACALL LCD_COMMAND
MOV A,#06H
ACALL LCD_COMMAND
MOV A,#80H
ACALL LCD_COMMAND
RET
LCD_COMMAND: MOV P2,A
CLR P3.7
CLR P3.6
SETB P3.5
ACALL DELAY
CLR P3.5
RET
LCD_DATA:
MOV P2,A
SETB P3.7
CLR P3.6
SETB P3.5
ACALL DELAY
CLR P3.5
RET
DELAY: MOV R4,#40
REPEAT: MOV R5,#230
REPEATT: DJNZ R5,REPEAT
DJNZ R4,REPEAT
RET
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