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From: cook@stout.atd.ucar.edu (Forrest Cook)
Newsgroups: sci.electronics
Subject: Re: micro-controller
Message-ID: <8669@ncar.ucar.edu>
Date: 2 Oct 90 03:41:09 GMT
References: <1990Oct1.152820.25144@athena.mit.edu>
Sender: news@ncar.ucar.edu
Organization: Atmospheric Technology Division/NCAR, Boulder, CO
Lines: 34

In article <1990Oct1.152820.25144@athena.mit.edu> chuck@mitlns.mit.edu writes:
...
>The poster mentioned the 1468... CMOS series which I find harder to 
>to find than a 68HC11A2.

>The 68HC11 F series is hard to get of course, but it was only introduced
this year.

And of course, there is the XC68HC11A8FN1, the chip that was sold
with those great 6811 evaluation boards.  The A8 had a nice feature
where it could boot out of EEPROM if one of the port pins was pulled
up.  This was done by a little test at the beginning of the internal
Buffalo Monitor.  Until recently, with the addition of the F series
I believe, The A8 was the only way to get a 68HC11 that could run
as a single chip with 512 bytes of program/data EEPROM and an async
serial port.  The A8 made for great RS-232 boxes,  I made a nice
serial mux and a micro size data acquisition system with it. Unfortunately,
the chip had an X on the front which I later found out meant eXperimental,
and almost impossible to buy more of.  Some of the later chips could
boot from EEPROM if you sacrificed the async port.  The new F series
chip was done right, with reset vectors in EEPROM, unfortunately, it
is in a bigger package, making our older boards obsolete :-(
It seems kind of funny that it took Moto so long to make the 68HC11 chips
work in a single chip mode when it was so close to begin with.  And then
there's that nagging little problem concerning large contiguous RAM space...
So close, yet so far.  At least you can get a nice C compiler for the
68HC11. (Archimedes)

.

--
 ^   ^  Forrest Cook - <<< We all P for IP, We all BM for IBM >>>
/|\ /|\ cook@stout.atd.ucar.edu WB0RIO (This posting is my OPINION)
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