Peter,

unfortunately, this is not my problem. The interrupt doesn't even occur once.
I tried everything. The bug (if there is one) must be in the initialization
routine (see below).

Anyway, many thanks for the help,

Hans J. Ziegler

>Hans,
>I have been using the 16C74 but not timer 2. However, I did have a problem
>with the timers when I forgot to clear the interrupt flag in the service
>routine. I notice that this is not done in your routines. You may like to
>try clearing the flag prior to setting the enable interrupt bits as well.
>
>Good luck,
>
>
>>Hello.
>>
>>I got a very urgent problem:
>>
>>I've got a working project and need to add a clock. I already use all the
>>timers, except timer2. Reading the data sheet says: timer2 increases until
>it
>>matches pr2. Then timer2 will reset and (if there is no postscaler) the
>>TMR2IF in the PIR1 register will be set.
>>Excellent. But this is exactly what doesn't work.
>>timer2 increases, resets on match with pr2, but that damned (sorry) TMR2IF
>is
>>not set. I am not using a CCP-Module and I do not want to do so. I just
want
>>timer2 (without any other module) to generate an interrupt after a match
>>occured. Perhaps it's just a little bug and I can't find it (since 2 days),
>>but I need your help and really do appreciate it.
>>Thanks in advance!
>>
>>Here is my test source (setbank is a macro to select file register bank):
>>
>>        org 0x00
>>        goto start
>>        org 0x04
>>        goto service
>>
>>start
>>        setbank 1
>>        movlw   H'10'
>>        movwf   PR2
>>        setbank 0
>>        clrf    TMR2
>>        clrf    T2CON
>>        bsf     T2CON,TMR2ON
>>        bcf     PIR1,TMR2IF
>>        setbank 1
>>        bsf     PIE1,TMR2IE
>>        setbank 0
>>        bsf     INTCON,GIE
>>        bsf     INTCON,PEIE
>>
>>
>>loop
>>        nop
>>        nop
>>        goto    loop
>>
>>service
>>        nop
>>        nop
>>        retfie
>>
>>        end
>>
>>
>>Hans J. Ziegler
>>
>>
>Peter Grey
>Australia