Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!brutus.cs.uiuc.edu!psuvax1!psuvm!psuecl!peg
From: peg@psuecl.bitnet
Newsgroups: sci.electronics
Subject: Re: Stand-alone UART needed
Message-ID: <62498@psuecl.bitnet>
Date: 28 Oct 89 23:13:42 GMT
References: <826@soleil.UUCP>
Organization: Engineering Computer Lab, Pennsylvania State University
Lines: 31

In article <826@soleil.UUCP>, gopstein@soleil.UUCP (Rich Gopstein) writes:
>
> I have looked around at a couple of UARTS, but the ones I looked at
> (8250, 2651?) were designed to interface to a computer bus.  I need
> UARTS that can be strapped to run with the desired bits-per-character,
> stop-bits, etc.  (i.e. I want a UART whose configuration is set via
> its external pins, not via an internal register that must be set each

Hey!

I suggest you look for one of several UART's.  I don't have much data
on any of them (well, I do somewhere, but can't find it!!), but I think
they might do the job.

 1)  6402 or 6403

 2)  AY-3-1015 or AY-5-1013  (General Instruments, et al)

This is off the top of my head, though, and my memory is kinda fuzzy.
These are rather old UART's--I believe they were used in many of the
early terminals/TTY's that had no processors.  They are still available,
though; I know Jameco has them.

If I can find the data sheets (I might have trashed them) I'll let you
know.  Oh, wait!!  The CMOS cookbook (Don Lancaster-Sams Books) has a
circuit using the 6402.  It is pin-strapped, but needs an external
clock.  I think one of the AY's has an internal oscillator.  I'll keep
looking!

Anyone else know more?

Paul