lcd.asm

lcd显示程序

;0123456789012345;
;  Wang fucheng  ;
;TEL:[phone] ;
;0123456789012345;

;+++++++++++++++++++++++++
;位定义
	   RS      bit P2.5
       R_W     BIT P2.6
       ADD_LCD BIT P2.7			;1=RAM
                            	;0=ADD_LCD
;++++++++++++++++++++++++++
;寄存器定义
		DIS_RAM		EQU	30H		 ;30H~4FH
		DIS_ADD		EQU	50H		;显示地址
;_____________________________
				



		org		0h
		jmp		begin
;:::::::::::::::::::::::::::::::::::::::::::::::
dis_WR:		setb	R_W
			MOVX	A,@R0
			ANL		A,#80H
			JNZ		DIS_WR
			CLR		R_W
			MOV		A,B
			MOVX	@R0,A
			RET
;________________________________________________
INIT_LCD: clr add_lcd
         clr rs
         clr R_W
		 MOV	B,#3CH	   ;模式；8位2行显示
		 LCALL	DIS_WR
		 mov	B,#01h	   ;清除显示
		 lcall	dis_WR
		 MOV	B,#03H		;归位
		 LCALL	DIS_WR
		 MOV	B,#06H		;自动加1
		 LCALL	DIS_WR
		 MOV	B,#0CH		;开显示，无光标，不闪烁
		 LCALL	DIS_WR
		 SETB	ADD_LCD
		 SETB	RS
		 SETB	R_W
		RET
;+++++++++++++++++++++++++++++++++++++++++++++++++++
DELAY0: MOV R6,#0aH       ;  5 ms
DELAY1: MOV R7,#0EAH      ;  0.5 ms
       DJNZ R7,$
       DJNZ R6,DELAY1
       RET

;::::::::::::::::::::::::::::::::::::::
XIANSHI:	CLR	RS
			SETB	R_W
			CLR		ADD_LCD
			MOVX	A,@R0
			ANL		A,#80H
			JNZ		XIANSHIEND
			MOV		A,DIS_ADD
			CJNE	A,#4FH,XIANSHI1
			MOV		DIS_ADD,#30H
			CLR		RS
			CLR		R_W
			CLR		ADD_LCD
		 	MOV	B,#03H		;归位
		 	LCALL	DIS_WR
			LCALL	DELAY0
XIANSHI1:	MOV		A,DIS_ADD
			INC		A
			MOV		DIS_ADD,A
			SETB	RS
			CLR		R_W
			CLR		ADD_LCD
			MOVX	@R0,A
XIANSHIEND:	SETB	RS
			SETB	R_W
			SETB	ADD_LCD
			RET
;+++++++=======++++++++++++++++++++++++++++++
begin:      LCALL 	INIT_LCD
			MOV		DIS_ADD,#30H 		;显示指针初始化
			MOV		DPTR,#BIAOTI
			MOV		R1,#30H
BEGIN1:		CLR		A					 ;显示区初始化
			MOVC	A,@A+DPTR	
			MOV		@R1,A
			INC		DPTR
			INC		R1
			CJNE	R1,#50H,BEGIN1
			MOV		R4,#0FFH
DIS_BIAOTI0:			MOV		R3,#0FFH
DIS_BIAOTI:	LCALL	XIANSHI
			DJNZ	R3,DIS_BIAOTI
			DJNZ	R4,DIS_BIAOTI0
WORK:		LCALL	XIANSHI
			
			JMP		WORK

;____________________0123456789abcdef0123456789abcdef_________________
BIAOTI:			DB 	"  Wang fucheng  TEL: [phone]"
SHUIWEN_DIS:	DB	"lengquye:  ___  kai:___ guan:___"
yeyawendu:		db	"yeya:      ___  kai:___ guan:___"
jiezhi:			db	"jiezhi:    ___  kai:___ guan:___"
END