Hi all

 I'm new at making programs for the PIC* processors. And now i have some
trouble, I'm using a 16c84. I have made a very simple program, that just
flashes with two led's, sometimes it works (and both led's flash), but
mostly it's only one of them flashes, or nothing at all happens! Is there
any logical explanation of this behaviour? I'm using a xtal of 3.579545Mhz,
33pf to ground on each side of the xtal, and 100k from MCLR to VDD. The
program i'm using is as follows:

start   bsf     STATUS,RP0
        clrf    PORTB

        movlw   00H
        movwf   TRISB   ; Set port b as outputs
        bsf     TRISB,7 ; set pin rb7 as input
        bcf     OPTION_REG,7 ; make internal pull-up on portb;

l001    call    Delay
        bsf     PORTB,3 ; set portb pins high
        bcf     PORTB,2
        call    Delay
        bcf     PORTB,3
        bsf     PORTB,2
        goto    l001

Delay       movlw   0x01
Delay1      movwf   cou1

Del1

Delay2      movlw   0xff
            movwf   cou2
Del2

Delay3      movlw   0xff
            movwf   cou3

Del3        decfsz  cou3
            goto    Del3

            decfsz  cou2
            goto    Del2

            decfsz  cou1
            goto    Del1

            Return


Is there anything wrong with this?


Greetings Thomas