At 03:34 PM 8/2/2010, Olin Lathrop wrote:

> >> Right, because you were using it in synchronous mode where the clock
> >> comes in with the data.  Isaac is correct when the module being used
> >> as a UART, but not as a USRT.

Yep.

Here is the relevant text from the 'F77 data sheet:

10.4 USART Synchronous Slave Mode
Synchronous Slave mode differs from the Master mode, in that the=20
shift clock is supplied externally at the RC6/TX/CK pin (instead of=20
being supplied internally in Master mode). This allows the device to=20
transfer or receive data while in SLEEP mode.

Anyway, the system wakes up from sleep reliably using this=20
technique.  The real charm is that the only hardware addition was a=20
single resistor between the TX & RX pins on the little add-on board.

Hopefully this is of some benefit to someone someday.

dwayne

--=20
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing
--=20
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