Nick Veys wrote:
>
> Been trying to get a timer to fire off on my 16F870 for a while now...
>
> I tried TMR0 since I had experience setting it on from my 16F84a.  Here
> are the steps I take:
>
> Set up TMR0 configuration stuff, prescalar, etc. (watchdog disabled of
> course)
> Enable T0 interrupt
> Enable Global Interrupts

This should work...

        org 0h              ; startup vector = 0000

        goto Start

        org 4h

        ; save registers etc.
        bcf INTCON,T0IF
        ; do something
        ; restore registers
        retfie

;
; ----------
; CODE START
; ----------
;
Start   ; port setups etc.


        bsf STATUS,RP0
        movlw b'10000000'
        movwf OPTION_REG   ; prescale = 1:2 = TMR0 = INT
        bcf STATUS,RP0     ; ram page 0
        clrf PCLATH


        clrf TMR0
        clrf INTCON
        bsf INTCON,T0IE
        bsf INTCON,GIE
here    nop                ; jumps to IRQ on TMR0 overflow
        goto here





--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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