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UART x3

I am looking for an PIC with three UART ports if such a thing exists. have two UART inputs and I want to output a single UART output. I've see plenty of ICs with 2 UART ports, but I have yet to find one with three. typically use microchip ICs, but I am open to any brand as long as i would do the trick and has a good C compiler.

How would a situation like this be handled in modern electronics? I am student and we typically would solve something like this with a MUX However, 1) it seems pretty "primitve" for today's electronics - are thes still used? and 2) I would like to use all three UART ports at the sam time.

I was thinking of two ICs, but with only 2 UARTs that wouldn't solve th problem. The only other idea I could come up with would be to have an I to store the data from each UART input to a memory IC. A third IC woul then read/write from the shared memory and output a single UART output.

Is there anything simple that would solve my problem? I am a software gu and am not very good with hardware. Any advice or even google search word would be appreciated. Thanks for the help.

Reply to
jonathan03
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If the bitrate isn't too high, you could bitbang one of the UARTs. The output would be the easiest. You can use a timer interrupt programmed at the exact length of a bit, and keep a small state machine to sequentially write the bits.

Reply to
Arlet

Atmel AVR ATMega 640/1280/2560 has four hardware UARTs. The programming architecture is much more straigghtforward and C friendly than the PIC's with their crippled architecture. A decent gcc port does exist, and there are also some good commercial tools (Imagecraft, Codevision, IAR (expensive!!!)).

Mit freundlichen Grüßen

Frank-Christian Krügel

Reply to
Frank-Christian Kruegel

If the baudrate is sensible, and depending on other interrupt activity, a soft UART is easy enough, especially for TX only. Creative use of a timer compare output might also be possible if interrupt jitter is a problem.

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Reply to
Mike Harrison

As I read this, you are saying that two of your serial signals are receive-only, while the third is transmit-only.

Can you not use UART1 to receive one receive only signal and send the transmit-only signal, and use UART2 to receive the second receive-only signal?

On most UARTs that I've used, the transmit and receive sections are independent, except for baud rate.

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Reply to
Peter Bennett

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