0802play.asm

学林电子实验箱源码 完整板

;0802液晶显示网站的广告
;***************************************************************************
;*  [e-mail]		     (51c51 test web)     www.8951.com     *
;*  Create by :石学军      www.51c51.com 更多例程请登陆网站        	   *
;***************************************************************************
	RS EQU P2.0
	RW EQU P2.1
	E EQU P2.2
	MOV p0,#01H		;清除屏幕
	ACALL ENABLE
	MOV p0,#38H		;8位点阵
	ACALL ENABLE
	MOV p0,#0FH		;显示开
	ACALL ENABLE
	MOV p0,#06H		;移动光标
	ACALL ENABLE
GOO: CALL DELAY2
    MOV P0,#01H

	ACALL ENABLE

	MOV p0,#80H		;显示位置
	ACALL ENABLE
	mov dptr,#table3
	call write1
	mov p0,#0c0h
	call enable
	mov dptr,#table2
	call write1

	call enable
 CALL DELAY2
   MOV P0,#01H
	ACALL ENABLE
	MOV p0,#80H		;显示位置
	ACALL ENABLE
	mov dptr,#table4
	call write1
	mov p0,#0c0h
	call enable
	mov dptr,#table5
	call write1

	call enable
	jmp GOO

ENABLE:				;送命令
	CLR RS
	CLR RW
	CLR E
	ACALL DELAY
	SETB E
	RET
write1:				;写一段话
	mov r1,#00h
	a1:mov a,r1
	movc a,@a+dptr
	call write2
	inc r1
	cjne a,#00h,a1
	ret
write2:				;写一个字节
	mov p0,a
	setb rs
	clr rw
	clr e
	call delay
	setb e
	ret
delay:				;延时子程序。
	mov r7,#255
	d1:mov r6,#25
	d2:djnz r6,d2
	djnz r7,d1
	ret

delay2:	mov r5,#50	;延时。
d4: 	mov r6,#40
d3:	mov r7,#248
	djnz r7,$
	djnz r6,d3
	djnz r5,d4
	ret
TABLE5:db "51MCUBOX",00H
TABLE4:db "89956892",00H
table3: db "8951.COM",00H
table2: db "GO-51C51",00H
end