[Coco] Re: 68B09P - Datasheet?

[jdaggett at gate.net]

The HC12 instruction set is more like that of the MC6809. There are 
more instrtuctions in the HC12 but it has one less register than the 
6809. That is the U  pointer register. 

The HC12 is a good processor. The PICs offer better cost. 

james

On 26 May 2005 at 6:20, Frank Pittel wrote:

Date sent:      	Thu, 26 May 2005 06:20:16 -0500
From:           	Frank Pittel <fwp at deepthought.com>
To:             	CoCoList for Color Computer Enthusiasts 
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Subject:        	Re: [Coco] Re: 68B09P - Datasheet?
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> Never cared much for pics. You may want to consider using a
> micro-controller such as the 68hc11 or 68hc12. The core processor is
> very similar to the 6809 and the chips have built in I/O ports, eeprom
> and ram. Do a google search on either 68hc11/68hc12 and prototype and
> you'll see a lot of good boards for a reasonable amount of money.
> 
> Fran
> 
> 
> 
> On Wed, May 25, 2005 at 07:35:28AM -0700, Andrew wrote:
> > All,
> > 
> > I recently went to my favorite used/surplus electronics/mechanical
> > parts supplier here in Phoenix (Apache Reclamation) - and out in
> > their yard I discovered a whole mess of old slot machines and parts.
> > Some of these parts were logic motherboards, which had on them
> > various 74LSxx parts, some EPROMs, and - a 68B09P processor...
> > 
> > I am in the process of designing and building a robotic device, and
> > a portion of it I was originally planning to control with a 16F84
> > PIC - but seeing these 6809 processors lit my eyes up.
> > 
> > I was wondering if these would be worthwhile to investigate (as I
> > could likely get the boards really cheap), or if I should just stick
> > with PICs - or if the processors might be good for something else?
> > 
> > I can't find a datasheet, though, to determine this. Unfortunately,
> > I don't know the manufacturer of this particular instance of the
> > chip, either.
> > 
> > All I have been able to google tells me that this is a 40 pin chip
> > (duh), with a 2MHz internal clock. No mention of any on-board memory
> > or such...
> > 
> > I realize that there probably isn't an EEPROM or FLASH on board this
> > chip - but how difficult is it to interface such things to it
> > (providing I have datasheets)? Would it be worth the trouble for
> > robotics use, or would I be better served sticking with PICs?
> > 
> > Something tells me "stick with PICs" - because I fear I would be
> > spending too much time on the interface needs of the 6809 (ie,
> > essentially building a PIC) - but I wanted to get the group's
> > opinion and ideas on the matter, in case someone has some relevant
> > knowledge in the matter.
> > 
> > Even with using a PIC, this is going to be an "uphill" struggle for
> > me, as I am going to still have to build a simple programmer, learn
> > PIC assembler (or somehow beg/borrow a PIC BASIC compiler), then
> > learn how to use it in a circuit, etc - to control my robot. But,
> > fortunately, there are tons of examples on this on the Net, so
> > though it might be rough, it is doable.
> > 
> > All I would have using a 6809 would be this forum, any datasheet I
> > could scrounge up, my back stock of old Rainbows, plus the little
> > informational books I have on such old processors (mainly textbooks
> > on interface designs for microprocessors and control use).
> > 
> > Andrew Ayers
> > Glendale, Arizona
> > 
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> 
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