Hi , i wanna turn a led on and then off. and that should be in a loop ..
so i have written a code. is it correct and am i supporsed to to use a cristal. of can i use the internal clock i'm Using PIC16F84A

Please help Me.

code :

__CONFIG _CP_OFF & _WDT_OFF & _BOREN_OFF & _MCLRE_OFF & _LVP_OFF & _INTOSC_OSC_NOCLKOUT & _PWRTE_ON

bsf STATUS,5
movlw 00h
movwf TRISA
bcf STATUS,5

Start movlw 02h
movwf PORTA
movlw 00h
movwf PORTA
goto Start
end

 

I suggest you lose the antique 16F84, and use a more modern device - and my first tutorial does exactly what you want, using the F84's replacement, the 16F628 - it would be trivial to convert to the 84 if you really had to.

__________________
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between movwf PORTA & movlw 00h you must have a delay.and i think there is a porb with your fuses.16f84a doesn't have internal osc.

 

hey are you sure , that means i have to use an external osc ( Crystal )

 

yes.and you should have a loop between movwf PORTA & movlw 00h.you can use a rc osc.

 

sorry not loop,a subroutine.

 

rc osc means we're doing what the crystal do by coding right ?

 

Yep, here's a link, not sure about the 16F84 getting an I/O pin out of the deal though.
PS your program will probably run so fast you wont see it blink.
http://www.mikroe.com/en/books/picbook/2_02chapter.htm

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

Wow thanks