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October 10, 2018 11:12
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;==================================== | |
; @copyright-Abdul Rehman | |
; @Licence Creative Common | |
; This code used to display simple character... | |
; on character lcd with 8051 microcontroller in assembly langauge | |
;==================================== | |
LCD_DATA_PORT EQU P0 | |
RS BIT P2.0 | |
EN BIT P2.1 | |
;==================================== | |
ORG 0H | |
;------------------------------------ | |
MAIN: | |
ACALL LCD_INIT | |
MOV A,#'D' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
ACALL DELAY1 | |
MOV A,#'O' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
MOV A,#'N' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
MOV A,#'E' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
MOV A,#'.' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
MOV A,#'.' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
MOV A,#'.' | |
ACALL LCD_WRITE_DATA | |
ACALL DELAY1 | |
;----------------------------------- | |
MLOOP: | |
SJMP MLOOP | |
;------------------------------------- | |
; LCD INTERFACING CODE IN 8BIT MODE | |
;------------------------------------- | |
LCD_INIT: | |
MOV A,#38H ;THIS COMMAND TELLS LCD TO INITIALIZE 5x7 2LINE | |
ACALL LCD_WRITE_CMD | |
ACALL DELAY1 | |
MOV A,#0FH ;DISPLAY ON, CURSOR ON | |
ACALL LCD_WRITE_CMD | |
ACALL DELAY1 | |
RET | |
LCD_CLR: | |
;CLEAR ALL CHARACTERS FROM LCD DISPLAY | |
MOV A,#0H | |
ACALL LCD_WRITE_DATA | |
RET | |
LCD_WRITE_CMD: | |
;THIS FUNCTION WILL PUT COMMAND | |
;INTO LCD's COMMAND REGISTER | |
MOV LCD_DATA_PORT,A | |
CLR RS | |
SETB EN | |
NOP | |
NOP | |
NOP | |
CLR EN | |
RET | |
LCD_WRITE_DATA: | |
;THIS FUNCTION WILL DISPLAY | |
;DATA ONTO LCD | |
MOV LCD_DATA_PORT,A | |
SETB RS | |
SETB EN | |
NOP | |
NOP | |
NOP | |
NOP | |
CLR EN | |
RET | |
;=================================== | |
DELAY1: | |
MOV R6,#255 | |
D1L1: | |
MOV R7,#255 | |
DJNZ R7,$ | |
DJNZ R6,D1L1 | |
RET | |
;=================================== | |
END |
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Thank you! Are you sure that clear (line 70) is 0x00 DATA?
This doc describes, that in order to clear LCD microcontroller should provide 0x01 COMMAND to LCD