51 MCU drives 1602 LCD assembly language program-EEWORLD

Collect

LCMRS EQU P2.4

LCMRW EQU P2.5
LCMEN EQU P2.6
LCMDATA EQU P0

ORG 0000H
LJMP MAIN
ORG 0030H

MAIN:
MOV SP,#60H
LCALL LCMSET
LCALL LCMCLR
MOV A,#80H
LCALL LCMWR0
MOV DPTR,#TAB0
LCALL LCMWR2
MOV A,#0C0H
LCALL LCMWR0
MOV DPTR,#TAB1
LCALL LCMWR2
SJMP$

TAB0: DB "I AM YUAN MING",00H
TAB1: DB "NICE TO MEET YOU",00H

LCMLAY: ; Read busy program, used to determine whether d7 is 0
PUSH ACC
LOOP:
CLR LCMEN
CLR LCMRS
SETB LCMRW
SETB LCMEN
MOV A,LCMDATA
CLR LCMEN
JB ACC.7,LOOP
POP ACC
LCALL DELAY
RIGHT


LCMWR0: ;Write instruction
LCALL LCMLAY
CLR LCMEN
CLR LCMRS
CLR LCMRW
SETB LCMEN
MOV LCMDATA,A
CLR LCMEN
RIGHT

LCMWR1: ;Write data
LCALL LCMLAY
CLR LCMEN
SETB LCMRS
CLR LCMRW
SETB LCMEN
MOV LCMDATA,A
CLR LCMEN
RIGHT

LCMWR2: Write string (string belongs to data)
PUSH ACC
RUN1:
CLR A
MOVC A,@A+DPTR
JZ LOOP2
LCALL LCMWR1
INC DPTR
LJMP LOOP1
LOOP2:
POP ACC
RIGHT

LCMSET: ; Program initialization
MOV A,#38H
LCALL LCMWR0
MOV A,#08H
LCALL LCMWR0
MOV A,#01H
LCALL LCMWR0
MOV A,#06H
LCALL LCMWR0
MOV A,#0CH
LCALL LCMWR0
RIGHT

LCMCLR: ; Qingping
MOV A,#01H
LCALL LCMWR0
RIGHT


DELAY:
MOV R6,#5 ;2.7MS delay subroutine (function unknown)
D1:  MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RIGHT


END

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