On Thu, 05 Jun 2003 10:07:27 -0500, David VanHorn wrote:
>At 09:49 AM 6/5/2003 +0100, Alan B. Pearce wrote:
>
>>>I've done 1X at 9600 transmit and receive, in an F84. When I=
 got
>>>the start bit int, I delayed half a bit time, then sampled=
 every
>>>bit time.  Worked fine.

>Absolutely. However, the app was half-duplex. Many times, you=
 are
>doing query-response, which is inherently half duplex.

1) So, in this application, you are only using the external=
 interrupt to
sense the start of an incoming byte and then you poll for the=
 level changes
afterwards?

2) If you did not have an external interrupt available to sense=
 the start of
a byte, how many times the bit rate would you need to sample/poll=
 for
reliable receive? 4X?

Tim

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