At 12:25 PM 5/6/2003 +0200, you wrote:
>Hi.
>Looking in the data sheet for the 16F628, I can see
>no specified data for 9600 baud below 1Mhz Xtal freq.
>Have anyone used the UART at 9600 baud at lower
>speeds then 1Mhz ?
>
>I'm looking at a (very) lowpower application, and
>one (or "the") way to get low power is low speed, right ?
>A couple of 100's kHz would probably be just fine.
>
>It will just be a/some PIC talking on a serial line and
>on non-volatile memory, probably FRAM due to the write speed.
>
>The "other side" is fixed to 9600 baud.

I think the lowest frequency you can operate at would be 153.6 kHz
(use a standard tuning fork style crystal), with BRGH=1 and SPRG=0.
Check it, that's back-of-envelope.

Depending on what you are doing, you might be able to get almost as good
results by sleeping the micro between bursts and running at a more
standard frequency like 4MHz.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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