Can it work ?

soulweed · Joined: 20 Oct 2006 Posts: 23

I need to use 2 Rx and 1 Tx then i use 74HCT157 for select data source

Please tell me.Can it work?

I 'm using PIC18F452

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

Sure, put the multiplexer chip between the PIC and the RS232 level shifter.
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Humberto · Posted: Thu Mar 22, 2007 11:53 am

Also you can add "extra Rx hardware" functionalities using the INT0..INT2 (pins RB0...RB2)
with the advantage that it will get an interrupt (EXT_INT) in the Start bit of the first
arrived character and do not need any polling nor multiplexing overhead
generated by handling the 74HCT157.

Humberto

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley