Information about Motorola 6809 and 68HC11

[BliZzArD182]

Hello everybody

I´ve searched this forum but i didn´t find any useful information. I need to make soe research about this two processors. Among all of the things i would like to know is the bits in the data and address bus, arquitecture in general, etc.

I think i am searching in the wrong places because i find a lot of information about the design but i need something more general, more easy to understand the differences between this two processors.

I have a guide from this place about the HC11 but when i look for the 6809 i get a lot of info that (from what i understand) is not helpful.

Can anyone help me? I would really appreciate some advice.

Thanks

Regards

Sebastian.

[bigmac]

Hello Sebastian,

The 6809 dates back more than 25 years.  I would suggest that you do a Google search on "Motorola 6809" - it seems to present quite a few relevant references.  Here is the Wikipedia reference
http://en.wikipedia.org/wiki/Motorola_6809.

For the MCUs of this vintage all program memory and I/O was external to the chip.  I don't think there was even an on-chip timer.  There was a small amount of RAM on the chip and there were external IRQ and NMI inputs.

I am not sure about the 6809, but surprisingly the 6800 and the 6805 was backward compatible with source code (and I think maybe even machine code) for the 68HC11.

Regards,
Mac

Message Edited by bigmac on 05-13-200611:54 PM

[rhinoceroshead]

Wow!  6809?  I assumed that was a typo.  :-)  Before my time I guess...

[rhinoceroshead]

If you download the datasheet and look at the CPU section, it should say just about everything you would ever care to know.  But generally, the HC05, HC(S)08, HC11, and HC(S)12 are all Von Neumann architecture with a 16 bit address bus and 8 bit data bus - except the HC(S)12 has a 16 bit data bus.

[mke_et]

There's a ton of info out there for the 6809 if you look for Tandy Computers.  The 6809E was used in all the Radio Shack 'color computers' except for the MC-10 model.

There were some neat operating systems for it too, like Flex and OS/9.

Neat processor.

[w8abz]

Frightening to admit, but I still have my copy of the "Motorola Microprocessors Data Manual" from 1981, with data sheets for MC6800, 6801/03, 6802/08, 6805P2/P4/R2/T2/U2, 6809E, 68000 and their many various peripheral chips.  BTW, the Radio Shack Color Computer was pretty much a minor modification to the MC6883 (DRAM controller chip) "sample application" schematic, using the 6847 for color video/graphics.

I had Microware OS-9 (hyphen, not slash like IBM OS/2) on my "CoCo" and later on single-board 6809 kit.  Had the op system, C compiler, Pascal compiler and Basic compiler all on one 720k 3.5" floppy, leaving the second floppy for a "user disk"!!!  OS-9 was a modular, multi-user, tightly-coded OS and was later migrated to OS-9/68K on the 68000/68020.

I always thought it unfortunate that IBM went with Intel/Microsoft instead of Motorola/Microware for the IBM PC.  Imagine a huge campus in Des Moines...

Anyway, if you need further details from the 6809E datasheet, justsayso!  If you need one or two of the actual chips, I still have a couple of those, too!  (1 MHz and the 2 MHz 68B09E even!)

Man, I'm such a relic.....

[BliZzArD182]

Thank you guys. I did a google search but was´t able to find any information about the 6809 itself. I found something about the HC09 which i think it could be the name-code.

I downloaded the data summary of all the 8 bit processor and the 6809 doesn´t appear, which is strange. That´s why i think that´s the "informal" name and i am missing something.

Thanks again.

Regards

[bigmac]

Here is another reference to 6809 information
http://koti.mbnet.fi/~atjs/mc6809/

I can only repeat that a Google search on "motorola 6809" provides many links that directly pertain to the subject.

Regards,
Mac

[Wings]

Wow.... the good ole 6809. I remember it well. You guys remember the Exorcisor? Moto's 8-bit development system from the late 70's. Cost me $10,000.00, and that was in 1977 dollars. Designed a dual processor CPU board for the Exorcisor, one a 6800 and the other a 6809. You'd write your '09 code using the cross-assembler running on the 6800, then hold down the Reset switch while you toggled the CPU switch on the board. It came up running the '09 with your code ready to rumble. Had to write a 6809 monitor/debug for the thing too, since at that time there was nothing on the planet to develop '09 code, not even from Moto. I recall getting one of the first '09 chips that came out of their labs.

The '09 was a really cool chip. Wrote a Forth compiler for the thing - with it's 2 stack pointers, 2 index registers & 2 accumulators it was a pleasure to program and a natural for Forth. Wish today's '05s & '08s had the same architecture.

[eckhard]

Hello,

Roger Schefer has some info about the 6809 and other useful links too.

www.ezl.com/~rsch/

Eckhard

[BliZzArD182]

Thank you very much guys. I think i have what i needed for now

=)

Bye

[hmsmith]

Try MC6809

Regards