lcd_2.asm

128*64液晶显示汇编程序

RS EQU P3.7 
RW EQU P3.6 
E EQU P3.5

	ORG 0000H;
	AJMP MAIN;

MAIN:MOV P1,#01H;		清除屏幕
	ACALL ENABLE; 
	MOV P1,#38H;		8位点阵方式
	ACALL ENABLE;
	MOV P1,#0FH;		开显示
	ACALL ENABLE;
	MOV P1,#06H;		移动光标 
	ACALL ENABLE;

	CLR P3.4;		开背灯
	
	MOV R1,#20H;
START:	MOV R0,#00H;
LOOP:ACALL LOC;
	MOV P1,R1;		显示的字符
	ACALL WRITE;
	INC R0;
	INC R1;
	CJNE R0,#10H,LOOP;
	MOV R0,#40H;
LOOP1:ACALL LOC;
	MOV P1,R1;		显示的字符
	ACALL WRITE;
	INC R0;
	INC R1;
	CJNE R0,#50H,LOOP1;
	AJMP START;	
;	JMP $;

ENABLE:CLR RS;
	CLR RW;
	SETB E;
	ACALL DELAY;
	CLR E;
	RET;

WRITE:SETB RS;
	CLR RW;
	SETB E;
	ACALL DELAY;
	CLR E;
	RET;

LOC:MOV A,R0;			显示位置
	ORL A,#80H;		
	MOV P1,A;
	ACALL ENABLE;
	RET;

DELAY:MOV R7,#0FFH;		液晶需要的延时
DEL1:MOV R6,#0FFH;
DEL2:DJNZ R6,DEL2;
	DJNZ R7,DEL1;
	RET;

	END