piclist 1997\08\15\144650a >
Thread: UART problems
picon face BY : John Payson email (remove spam text)

>  If you want to receive RS232 with a PIC, at the very least you will
> require clamping diodes to both rails to protect the device from + -
> 10-15V.

All of the PIC's port pins have clamp diodes to ground that are spec'ed
to 10mA; almost all have clamp diodes to VDD as well (also 10mA).  Those
that don't are generally (in new data sheets*) spec'ed to tolerate inputs
up to 14 volts [a clamp zener would probably be a good idea in case the
RS-232 signal is a little "hot"].

(*) This spec wasn't in the older data sheets, but Microchip has indicated
   that it nonetheless applies to older parts as well as newer ones.

In reply to: <01BCA978.8AC3F900@ifs-greenm.sybase.com> from "Martin R. Green" at Aug 15, 97 12:35:26 pm
See also: www.piclist.com/techref/index.htm?key=uart+problems
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