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Can it work ?

 
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soulweed



Joined: 20 Oct 2006
Posts: 23

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Can it work ?
PostPosted: Thu Mar 22, 2007 9:01 am     Reply with quote
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

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PostPosted: Thu Mar 22, 2007 10:32 am     Reply with quote
Sure, put the multiplexer chip between the PIC and the RS232 level shifter.
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Humberto



Joined: 08 Sep 2003
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Location: Buenos Aires, La Reina del Plata

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PostPosted: Thu Mar 22, 2007 11:53 am     Reply with quote
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

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Re: Can it work ?
PostPosted: Thu Mar 22, 2007 3:31 pm     Reply with quote
soulweed wrote:
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

Yes, it can. But keep in mind that you will get the RX interrupt only from the RX line that's commutated to the PIC.
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