Hi ALL,

How to make assembly code AT89s51.My Project using Switch Button at P3.2 (INT 0) to start program.When start button pressed on lcd will shown messages "BEGIN TEST" and also use DIP Switch 2x8 pin at port 1 and LCD 2 x 16 line GDM 1602A at Port 0.After Swich Button execute I select one of DIP Switch is ON and begin to start test. When swich 1 is ON (connected to ground) on LCD will shown text ( e.g: TEST LCD 1 ). And next switch 2 is ON the LCD will shown text ( e.g: TEST LCD 2). It will happen looping until end switch (switch 8) .

Can anyone help me in this....

thank you

 

Anyone help me....plz

 

Notice your question starts "My Project", this means you need to do it - if you can't do it your teacher needs to find out so he can help, cheating helps no one - least of all you!.

__________________
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This is my hobbies project not for the school
I learn....is this wrong!!!! Sorry, guys

Here I have piece of subroutine to shown character on LCD 2 x 16 line
But if combine with Switch Button and DIP Switch what I means,
my program can't shown text on LCD

Anyone can complete my piece routine according my circuit????

Thank you

http://microcontroller.fateback.com/...racter%202.htm

;-----------------------------------------------------------------
org 0h
start: call init_LCD
mov R1,#80h
call write_inst
mov R1,#'H'
call write_data
mov R1,#'e'
call write_data
mov R1,#'l'
call write_data
mov R1,#'l'
call write_data
mov R1,#'o'
call write_data
mov R1,#' '
call write_data
mov R1,#'W'
call write_data
mov R1,#'o'
call write_data
mov R1,#'r'
call write_data
mov R1,#'l'
call write_data
mov R1,#'d'
call write_data
EndChar:
sjmp Endchar

Init_lcd:
mov r1,#00000001b ;Display clear
acall write_inst ;
mov r1,#00111000b ;Function set,
;Data 8 bit,2 line font 5x7
acall write_inst ;
mov r1,#00001100b ;Display on,
;cursor off,cursor blink off
acall write_inst
mov r1,#00000110b ;Entry mode, Set increment
acall write_inst
ret
;
Write_inst:
clr P2.0 ; RS = P2.0 = 0, write mode instruction
mov P0,R1 ; D7 s/d D0 = P0 = R1
setb P2.1 ; EN = 1 = P2.1
call delay; call delay time
clr P2.1 ; EN = 0 = P2.1
ret
;
Write_data:
setb P2.0 ; RS = P2.0 = 1, write mode data
mov P0,R1 ; D7 s/d D0 = P0 = R1
setb P2.1 ; EN = 1 = P2.1
call delay; call delay time
clr p2.1 ; EN = 0 = P2.1
ret
;
delay: mov R0,#0
delay1:mov R7,#0fh
djnz R7,$
djnz R0,delay1
ret
;
end

Attached Images

lcdc3.gif (6.7 KB, 4 views)