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Author: AashiDutt

LCD_Interface/LCD.asm

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+; Displaying character on LCD using Assembly Language
+
+ORG 00H
+	
+; RS = P2.0 , RW = P2.1, E=P2.2, D0 -D7 = P1.0 - P1.7
+
+RS EQU P2.0 ; EQU means equating (i.e RS = P2.0)
+RW EQU P2.1
+E  EQU P2.2
+	
+;LCD INITIALIZATION
+
+MOV P1,#38H    ;2 lines and 5x7 matrix 
+; load 38H data is loaded to port P1
+ACALL send_command
+
+MOV P1, #0EH   ; display on cursor blink
+ACALL send_command
+
+MOV P1 ,#01H   ;clear display screen
+ACALL send_command
+
+here: MOV P1,#80H  ; Force cursor to 1st line
+      ACALL send_command
+	  
+; Printing a command
+
+MOV P1,#'H'  ;#'E' means we want to transmit ASCII value of E
+ACALL send_data
+MOV P1,#'E'
+ACALL send_data
+MOV P1,#'L'
+ACALL send_data
+MOV P1,#'L'
+ACALL send_data
+MOV P1,#'O'
+ACALL send_data
+
+MOV P1,#0C0H ; Force cursor to 2nd line
+ACALL send_command
+
+MOV P1,#'W'
+ACALL send_data
+MOV P1,#'O'
+ACALL send_data
+MOV P1,#'R'
+ACALL send_data
+MOV P1,#'L'
+ACALL send_data
+MOV P1,#'D'
+ACALL send_data
+
+JMP here
+
+send_command:   CLR RW
+				CLR RS
+				SETB E
+				ACALL DELAY
+				CLR E
+				RET
+				
+send_data:      CLR RW
+				SETB RS
+				SETB E
+				ACALL DELAY
+				CLR E
+				RET
+				
+DELAY :  MOV R0, #10
+Here2 :  MOV R1, #255
+Here1 :  DJNZ r1, here1
+		 DJNZ R0, here2
+				 
+		RET				
+
+END