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crocontroller discussion list
|The following is info I have on a 68HC11 mailing list:
Welcome to the MC68HC11 mailing list. (last modified 15 March 1993)
This list is dedicated to discussions concerning the MC68HC11
single-chip microcontroller, its support chips, and the popular
Also, for the time being, discussions on the hc16 dsp chip
are welcome until such time as another forum is created, or
the volume of traffic dictates a split.
This is a semi-moderated group. Requests to subscribe,
unsubscribe, or other administrivia is handled on a case by
Please help keep the clutter in the group down. If you want
to subscribe, de-subscribe, or have other requests to make
about the mailing list, please send that sort of mail to
hipp.etsu.edu rather than the submission address, mc68hc11-request
hipp.etsu.edu. In order to avoid generating mc68hc11
endless mail loops (messages bouncing back and forth between
mindless mailers) some heuristics are applied to messages to
screen out those which appear to be errors or requests to be
added / deleted - if your message is less than 25 words or
longer than 5000 words, or contains "suspect" phrases
(such as subscribe) it will be routed to me and not sent
to the list. If necessary, I'll post it manually when I have
a chance to look at it.
Additionally, please read the FAQ list below before posting.
Your question might be answered before you get your first
Incidentally, hipp stands for the "Historic Image Processing
Project" - the main use of the storage on this PC.
FREQUENTLY ASKED QUESTIONS
0. "Who are you?"
Nick Sayer orginated the list, but found it growing very
rapidly and straining the connectivity resources of his machine.
I voluenteered to take the list over since I've been using the HC11
EVB in my classes for several years. There are now about 300
subscribers on the list located in 13 different countries.
The list is originated at the Department of Computer and Information
Sciences of East Texas State University, located in Commerce, Texas
about 60 miles east of Dallas. It was previously located in Flagstaff
Arizona, but was moved from there due to the lack of support for the
list and the fact that the administratior was laid off due to budget
cutbacks in higher education in Arizona.
Perhaps of some interest is that the list is being run on a 386 based
PC using the GNU copyleft 386BSD unix system, a terrific piece of
software for the price (free).
list admin (hipp.etsu.edu or wiermerlin.etsu.edu) wier
1. "What is the MC68HC11?"
It is a group of single-chip microcontrollers made by Motorola
based on the 6800 CPU. Unlike many such chips, however, the
chip can boot into an extended mode which replaces two of
the parallel ports with a complete address and data bus.
The very same chip, therefore, can be used for prototype AND
for the final product. This is truly a terrific chip!
The base model is the MC68HC11A8. It has the 6800 CPU, 8K of
factory programmed ROM, 512 bytes of EEPROM, 256 bytes of RAM,
1 serial port, 8 A/D converters, a timer/counter unit, a serial
communications channel (NOT an asynchronous serial port),
and 5 parallel ports. The A1 is used in the EVB, and is the same
thing without the ROM.
2. "What is the EVB or MC68HC11EVB?"
It is a circuit board containing a MC68HC11A1, a PRU (port
replacement unit - replaces the two ports taken up by the address
bus), 8K of external ROM - which contains a powerful monitor, and
two RS-232 ports.
You can plug one end of a cable into the EVB and the other end
into a socket in a product that would take a MC68HC11 and use
the monitor to debug the prototype hardware, or plug that cable
into a big storage scope and debug the software.... the mind
3. "How and/or where can I purchase an EVB?"
For the past several years, Motorola has run a "student design
contest" which has encouraged the use of the hc11/evb in
university courses. Thus universitys are frequently in a
position to order the EVB (or you may find them available off
the shelf at the U bookstore).
A number of "standard" electronics and component suppliers also
carry the board.
The EVB actually comes in three flavors -
The original EVB - which is what the moderator has used for several
years in design courses - a terrific deal for students at the
price of $68.11 (cute...). Instead of having them buy a text
(which would probably cost that anyway), they just bought an EVB
and got to take the computer with them at the end of the semester.
The course(s) was taught from the technical manuals included with
The EVB requires a dumb ascii terminal or better (Mac or PC
recommended) and a power supply with +5, and +/- 12 v (to run the
Unfortunately the current production status of the EVB is unknown.
In the fall of 1991 Motorola introduced two new products, the EVBII
The EVBII is a redesign of the EVB using "modern" technology, such
as a charge pump chip to develop the RS232 voltages. It also has
available a subsidary logic analyzer board. I've not had time
to look at this extensively yet. Also, the price range is up around
$150, making it too expensive for an individual student purchase
plan (at least at state supported universities).
To fill the gap left by the EVB, there is the EVBU (university
model) which is available at the original EVB price of $68.11.
(The last I heard, the EVB was available at $88, but hasn't been
confirmed recently). The EVBU is a usable microcontroller, but
is limited in such respects as memeory supplied. It does have
a wire wrap area (and in fact one student group here this spring
used and EVBU in a project and wire wrapped in a subsidiary
EPROM chip - not a big deal). It also includes a Real Time
Clock chip (although a number of boards received here early in
the production run were missing it).
Using a Mac or a PC with the EVB / EVBU / EVBII gives you a
complete development system at a VERY reasonable cost (assuming
you already have the computer). Freeware / Shareware is
available (cross - compilers, monitors, simple C compilers)
either at the ftp site here or elsewhere.
There was also an EVM (evaluation module) which was a higher
level product than the EVB. I'm not sure if it's still in
production or what it might cost.
The address and phone number for Motorola University Support is:
University Support 56-106
P.O. Box 52073
Phoenix, Az 85072
There is an excellent introductory article in June 1991 issue of
Computer Craft (formerly Modern Electronics) on M68HC11 micro-
controller and the EVB along with the above mentioned pricing
and availability infromation. Circuit Cellar also publishes
articles from time to time on the HC11.
HC11 information has also appeared in Circida's Circuit Cellar Ink,
(he also had a column in BYTE magazine for a number of years)
and Midnight Engineering magazine (strong on micro controller
Also, if you qualify, Embedded Systems magazine is very worthwhile
(a "controlled circulation" magazine).
I strongly recommend that anyone interested in buying the EVB should
call the University Support to confirm availability and price, before
sending in any money.
Disclaimer: I am not connected with Motorola or Computer Craft in any
way other than being a happy customer.
4. "How can I get in touch with Motorola to get technical info?"
As far as I can tell, Motorola University support (as they like to
call themselves) is headed by Fritz Wilson.
His office is in the Semiconductor Products Sector in
They can help you with pretty much anything, but beware, it's
usually pretty hard to get in touch with them, and they have
a real annoying voice mail system. ;)
All requests to them must be in writing. Students should include
a copy of their ID along with their written request.
FAX requests are accepted at the FAX number: 602-952-3621.
Otherwise, they give the address of:
P.O. BOX 52073
Phoenix, AZ 85072-2073
But, on another card I received, there is also listed the following:
3102 North 56th Street
Phoenix, AZ 85018-6606
When paying for something, they hold onto personal checks
until they clear the bank, so you may want to send a cashiers
check. If you can get your university to pay for it, you
can just send them the purchase order, and they will bill you.
5. "Where can I get support software?"
Right Here! Just anonymous ftp into pub/hc11 on hipp.etsu.edu
and you will find hc11 support software, mirroring the
Motorola freeware bulletin board (see below). Motorola
has given permission to make this available to encourge
wider distribution of hc11 tools via the Internet.
I plan on reorganizing this when I get a chance to make it
more logical. Honest.
You can call the Motorola "Freeware BBS" at 512-891-FREE (3733)
(1200/2400 bps). They have cross assemblers, sources for
the BUFFALO monitors, etc.
Other likely sites: here is an ARCHIE listing (as of 24 Apr 1992):
LOCATION (anonymous ftp via Internet) (many of these require BINARY
The OLD archive/mailing site was rainbow.cse.nau.edu or alternately,
red.cs.tcu.edu. These should NOT be used since they have been
superceeded by the etsu site.
If you find anything really neat at these sites, I'd appreciate
a note so I can put it in here.
6. What is the PowerGlove HC11 machine?
The powerglove is a device originally manufactured for video game usage,'
but which has been adapted as a general position sensitive input device.
It's of interest here because one of the major interfaces was developed
using the hc11 - doing an ARCHIE search turns up the following sites for
Host compute1.cc.ncsu.edu (184.108.40.206)
Last updated 02:47 15 Mar 1993
DIRECTORY rwxr-xr-x 512 Dec 5 18:23 hc11
Host ftp.nau.edu (220.127.116.11)
Last updated 02:41 15 Mar 1993
DIRECTORY rwxr-xr-x 512 Dec 5 04:30 hc11
Host frosch.cosy.sbg.ac.at (18.104.22.168)
Last updated 16:33 14 Mar 1993
DIRECTORY rwxr-xr-x 1024 Feb 13 15:17 hc11
Host wuarchive.wustl.edu (22.214.171.124)
Last updated 19:12 5 Mar 1993
DIRECTORY rwxr-xr-x 512 Dec 5 17:23 hc11
Host sunsite.unc.edu (126.96.36.199)
Last updated 01:00 3 Mar 1993
DIRECTORY rwxr-xr-x 512 Dec 3 07:22 hc11
Host plaza.aarnet.edu.au (188.8.131.52)
Last updated 06:43 27 Feb 1993
DIRECTORY rwxr-xr-x 512 Feb 1 00:59 hc11
- Bob Wier, keeper of the list
crocontroller discussion list
|>>Why on earth would you want to go and use an 8051, when you could use a
>>perfectly good PIC to do the job?
>Although I prefere PICs I was "forced" to use 8032 in my last project
>and only because I COULDN'T GET WANTED PART :((
>Supplyers in Germany are not very eager to sell stuff by mail, and
>local shops doesn't even bother to order some PICs, but Intel is
>represented on their shelves quite well...
>So, please if you know any supplyers near Croatia (lets say in Austria or
>Italy ) let me know of them.
>( mvsrce.srce.hr ) tibor
I don't know if this is considered as unwanted commercial advertising, but
I think will be told :-), and besides, I don't work for them - just happen
to have their catalog lying next to me:
RS Components have a reasonable (?) set of PIC processors and development sets
(PICStart 16B, 17A and 16C, PICMaster 16B, Promaster, PIC
According to my catalog, their telephone number for Austria is 02852 - 505,
for Germany 061 05 401 234, for Italy 02 27 425 1.
Their prices are generally not very low, but they promise to send any
amount of parts - down to a single resistor.
In addition, I still have a few postcards for catalog requests. So if you
just send me your address, I could mail them for you.
Markus (rz.uni-karlsruhe.de) bd24
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