Saturday, December 8, 2007

[piclist] Re: 12F675 Startup Problems

--- In piclist@yahoogroups.com, dlc <dlc@...> wrote:
>
> I have run serial comms at 9600 baud and lower using Microchip internal
> RC oscillators quite successfully for years. The secret is to keep
your
> dialog length very short, one or two bytes at a time so that clock
drift
> won't affect your data much.
>
> DLC

Hi DLC,

I must stress here that it is not the length of the packet that
compensates for the use of an inaccurate oscillator but the start bit
of each character sent. The leading edge of the start bit is what
causes the receiver to reset its timer. This happens for every
character that is sent. Keeping the packets short has no effect on
this re-sync.

Regards
Sergio Masci

http://www.xcprod.com/XCSB

.

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