>
> Loop
>                 MOVF PORTB,w  ; Read Portb into w register
>   MOVWF PORTA  ; Move W into Porta
>   BTFSC W,7  ; If bit 7 is set goto Chase
>   CALL Chase
>   CALL Loop  <<<<<<<

I think someone mentioned that the above will cause a stack overflow.

The section below probbaly won't execute as you want.
>From within 'Loop' an instruction called Chase.

>From within 'Chase' you GOTO Inttmr.
The return at the end of Inttmr will fall back to the instruction
following
'call Chase'

Try 'CALL Inttmr'

>
> Chase
>   Goto Inttmr  ; Initialise timer
>   BTFSS PORTB,7   <<<<<<<<<<<<<<<<<<<<<<<<<<<< THIS CODE WON'T EXECUTE
>   CALL Loop
>   BTFSS INTCON,2 ; If timer has overflowed than skip next
>   CALL Chase
>   GOTO Step
>
> ;--------------------------------------------------------------------------
>
> Inttmr
>   BCF STATUS,RP0
>   CLRF TMR0  ; Clear timer
>   BCF INTCON,INTF ; Clears the interupt if set
>   BSF STATUS,RP0
>   movlw   B'00000111'     ; Set prescaler to 255
>   movwf   OPTION_REG ; Option reg
>   BCF STATUS,RP0
>   RETURN
>


--
Best regards

Tony

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