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Assembly Language for PIC16f877a

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onionzai

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Dear all pros, i am currently using assembly language for my Final Year Project. Then i use MPLAB to convert the assembly code to hex code and download it into my Microcontroller using PICkit 2 v2.55. However, it didnt works well for me.

Currently im still testing everything using 2 LED.

This is the code.

list p=16F877,f=inhX32, x=on
#include <p16f877.inc>
errorlevel 0,-302 ;eliminate bank warning

__CONFIG _CP_OFF & _XT_OSC & _PWRTE_ON & _WDT_OFF & _LVP_OFF

cblock 0X20

count1
count2
count3

endc

status equ 03h
trisb equ 86h
portb equ 06h

org 0x00

bsf status, 5
movlw b'00000000'
movwf trisb
bcf status, 5


start
movlw b'10010000'
movwf portb
call delay
movlw b'00000000'
movwf portb
call delay
goto start


delay
loop1 decfsz count1, 1
goto loop1
decfsz count2, 1
goto loop1
decfsz count3, 1
goto loop1
return


end


I have uploaded the picture of topview of the circuit. Hope you pros can help me out ! :D
 

Tahmid

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Change
Code:
list p=16F877,f=inhX32, x=on
#include <p16f877.inc>
to
Code:
list p=16F877a,f=inhX32, x=on
#include <P16f877A.inc>
Then you don't need to declare status and the other SFRs, only write them in upper case.
Code:
list p=16F877a,f=inhX32, x=on
#include <p16f877a.inc>
errorlevel 0,-302 ;eliminate bank warning

__CONFIG _CP_OFF & _XT_OSC & _PWRTE_ON & _WDT_OFF & _LVP_OFF

cblock 0X20

count1
count2
count3

endc

org 0x00

bsf STATUS, 5
movlw b'00000000'
movwf TRISB
bcf STATUS, 5

movlw 0xaa
movwf count1
movwf count2
movwf count3

start
movlw b'10010000'
movwf PORTB
call delay
movlw b'00000000'
movwf PORTB
call delay
goto start


delay
loop1 decfsz count1, 1
goto loop1
decfsz count2, 1
goto loop1
decfsz count3, 1
goto loop1
return

end
You forgot to load the count registers. Load them as required as test.
Hope this helps.
Tahmid.
 

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