Scott recently was talking about accumulator registers...maybe that
would do the trick for you.

Josh

"Gennette, Bruce" wrote:
>
> For short messages I think it should be possible to implement simple, low
> speed (1200/2400) RS-232 in chips that have an internal 4MHz (nominal)
> oscillator *IF* the osccal can be loaded with a correctly calculated value.
> At these low speeds it should be possible to identify and synchronise with a
> start bit and then read in a few bytes before losing synchronisation.  If
> messages are restricted to that size comms should be possible.
>
> Does anyone know if osccal can be adjusted to slow the chip down by about 8%
> (((4-3.6864)/4)*100) ?
>
> If it can, what is the formula to calculate the osccal value from the
> factory supplied osccal adjustment value ?
>
> If it can't what is the formula to 'drop' cycles to simulate 3.6864MHz when
> the chip is operating at 4MHz ? (nop every 12.5 instructions ?)
>
> Thanx in advance.
> Bye.
>
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