Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!stratus!gitpyr!byron
From: byron@pyr.gatech.EDU (Byron A Jeff)
Newsgroups: sci.electronics
Subject: Re: I need a serial data decoder that....
Message-ID: <5249@pyr.gatech.EDU>
Date: 25 Mar 88 18:23:58 GMT
References: <2142@phoenix.Princeton.EDU< <3506@panda.UUCP>
Reply-To: byron@pyr.UUCP (Byron A Jeff)
Organization: Georgia Institute of Technology
Lines: 38

In article <3506@panda.UUCP< sfs@panda.UUCP (Stephen F. Santarelli) writes:
<
<
<>I have serial data coming in between 1200-9600 baud
<>I want to have a circuit display the value of each serially transmitted byte.
<>This is what I have right now:
<
<>serial data coming in   ----> MC14411(xtall controlled clock)  -->
<>				 MC6850(UART)  --> Two 7 segment displays
<
<
<>Can anyone tell me if there is a better way to do this?
<
<    The chip you are using was intended for use with a microprocessor type
<bus (i.e. data, address & control lines).  Why not use a real UART such
<as a 6402(MOSTEK)? This should minimize your hardware considerably.  
<
<    Have you considered what you will use to decode the parallel data
<(presumably ASCII) so that it will appear in some sort of readable form
<on your displays?  Perhaps you might divide the 8-bits into 3 octal digits
<(the most significant would only have two bits, of course), each using a
<separate 7447 to decode binary to 7-segment.  Or, maybe, use an 8-bit
<binary to 3-digit bcd converter(two 74185), once again with 3 7447's
<and 3 displays.  Or, if you can find one, possibly a chip which could
<drive two 7-segment displays with hex symbols (If somebody knows of one,
<let me know).  These chips should all be found in the TTL data book.
<
<	Good Luck
<
<		Stephen Santarelli de Brasch
<      

One chip that does what you ask is a 9368. Unfortunately I don't know
who manufactures it. It only drives a single display but I've built
a board that multiplexed 10 displays. It has ripple blanking and
latches its data.

BAJ