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Basic Connection: Microcontroller 8051 with Printer Dot Matrix

( Download Circuit File : printer1.pdf )
( Download asembly file :printer1.asm )
( How to build an easy and cheap Programmer 89Sxxx, only $1 )
( More about LPT Pin Configuration )

;===================================================
; Printing out data  to Dot Matrix Printer
; By: Triwiyanto
; www.mytutorialcafe.com
;===================================================
busy	   bit P1.5
strobe   bit P1.4 
portData equ P2  
;
	org 0h
start:	
	call word_Welcome ; to print ' Welcome To '
	call enter	  ; new line feed	
	call word_Lab	  ; to print ' Computer Laboratory '
	call enter        ; new line feed
	;
quit:	sjmp Quit         ; Hang Forever until reset pressed
;
;===========================================================
;This subroutine is used to print single character
;trough Port Data
;before printing a character,a busy signal must be detected
;till a low logic received, than a strobe ( --__-- ) pulse 
;must be generate to starts printing a character.
;==========================================================
Printchar:
	mov portData,A
	jb busy,$
	setb strobe
	clr strobe
	acall delay
	Setb strobe
	acall delay
	ret
;
delay:  mov R7,#2
del1:	mov R6,#20
	DJNZ R6,$
	DJNZ R7,del1
	ret
;===========================================================
;This subroutine is used to print a text ' Welcome To'
;this subroutine will print character by character till '$'
;character is detected, when this character is detected then
;It's indicated that a text has finished
;===========================================================
word_welcome:
	mov DPTR,#Text_welcome
lagi1:	clr A
	movc A,@A+DPTR
	cjne A,#'$',Print1
	sjmp Out1
Print1:	call Printchar
	inc dptr
	call delay
	sjmp lagi1
Out1:	ret			
;
;===========================================================
;This subroutine is used to print a text ' Computer Laboratorium'
;this subroutine will print character by character till '$'
;character is detected, when this character is detected then
;It's indicated that a text has finished
;==========================================================
word_Lab:
	mov DPTR,#Text_lab
lagi2:	clr A
	movc A,@A+DPTR
	cjne A,#'$',Print2
	sjmp Out2
Print2:	call Printchar
	inc dptr
	call delay
	sjmp lagi2
Out2:	ret			
;
Enter:
	mov A,#0dh
	call printchar
	call delay
	mov A,#0ah
	call printchar
	ret
;
Text_welcome:	DB ' Welcome To           $'
Text_Lab:  	DB ' Computer Laboratory  $'
;
end
           end

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Lesson 1:
T o o l
1.1. Programmer
1.2. Edsim 51
1.3. MIDE-51
1.4. ATMEL ISP

Lesson 2:
Input Output
2.1.LED
2.2.Swicht
2.3.7 Segmen
2.4.LCD Character
2.5.ADC
2.6.DAC
2.7.Motor Stepper
2.8.Keypad

Lesson 3:
Timer Counter
3.1.Basic
3.2.Mode 0
3.3.Mode 1
3.4.Mode 2
3.5.Mode 3

Lesson 4:
Serial Comm.
4.1.Basic
4.2.LED
4.3.Rotate LED
4.2 ADC
4.3.LCD

Lesson 5:
Interuption
5.1.Basic
5.2.Timer
5.2.External