> Hi,
>
> I want to transfer original 16f84 code to a 16f877 or a 16f88 because
> of the additional programming space needed. The code (a metronome
> combined with tuning fork) uses TMR0 interrupt without prescaler
> (interrupt at roll-over of TMR0) for the metronome function. A
> non-interrupt driven routine for the tuning-form mode (generating a
> sine at the selected frequency using a look-up table using a
> resistance ladder DAC). Tuning fork works fine on 16f877 and 16f88.
> Interrupt works fine until I change the tempo (using keys) a few time.
> Then suddenly the whole program 'hangs'. I did take care of the
> changed starting RAM (0x020) and the default ADC settings for port A
> on the 16f877/16f88.
>
> Does anyone has an idea what is wrong? Are there any differences
> between 16f84 and the other chips when interrupts are concerned?
>
> Regards,
>
> Stefan
>
>
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