Hi

Very interesting. I will probably try the INT for his Schmitt Trigger input
like the Rx Input.
.
I have take a look at the 877 data sheet and for now my conclusion is that
i must

Clear GIE bit, enable the INT, enter the Sleep mode, at wake up i must
disable the INT, i forget the first received byte, and

after some time i will be able to use the RS-232.

Is this make sense ?

Thanks.

Gilles




> > In sleep mode the 16f877 can't be awake from the serial port in
> > asynchronous mode right ?
>
> > There is a way, a trick, to make it alive with only these three wires
> > connected ?
>
>Tie the RX line to the INT pin or one of the interrupt on change pins.
>The only purpose of this is to allow a high to low transition on this line
>to wake the device from sleep.
>
>Keep in mind that the processor does not wake up instantly, especically
>when using a crystal to drive the oscillator.  This means the first serial
>byte will not be received correctly.  No problem if you can arrange for
>the host to send a wakeup byte, then wait about another byte time, then
>start sending the real data.
>
>
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