[Coco] Oscillator Circuits needed for EF68B09P 2MHZ versions I recently received

[Louis Ciotti]

Here is a pretty poor scan of one:

http://www.datasheetarchive.com/EF68B09P-datasheet.html



On Thu, Jun 7, 2012 at 1:28 AM, Computer Doc <computerdoc at sc.rr.com> wrote:
> Dear All,
>
> Thank you John Kent for that acute observation! :)  I appreciate it.  I
> should have noticed that, but for some reason I didn't.   I have been
> looking for several days, since receiving your email, for the datasheet for
> Thomson's EF68B09P chip, but I can't seem to locate one.  I want to build
> Grant Searle's 6-Chip 6809 Computer as my first 6809 project since it has
> the fewest parts count for any 6809 computer running Basic that I have ever
> seen!  I'm not a Computer Electronics Engineer, but I love to learn from
> other people's projects and then modify them for what I think might be
> interesting.  The datasheet for Motorola's MC6809 processor utilizes a
> crystal connected to pins 38 & 39 along with two capacitors connected from
> each pin to ground as you all know.  I could not find any new MC68B09P chips
> anywhere, so when I spotted the EF68B09P chip on ebay, I went ahead and
> ordered it thinking it used a crystal also.  Since the EF68B09EP doesn't,
> maybe the EF68B09P doesn't either.  So for right now, I have two EF68B09Ps
> that I can't use yet.  Any help finding the datasheet on the EF68B09P
> version would be much appreciated.  Evidently I've not yet found the "magic"
> 6809 part number for the search engine to locate it.  I can't hardly wait to
> start building it.  Have a good day everybody. :)
>
> Kip
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of John Kent
> Sent: Sunday, June 03, 2012 2:51 AM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] Oscillator Circuits needed for EF68B09P 2MHZ versions I
> recently received
>
> Althought the link suggests the data sheet is for a EF6809P, the png image
> on the web site says EF6809E. Often the datasheet web sites get their data
> sheets mixed up. As Gene said the 6809E requires external clock generation
> which might be what you were referring to. I didn't want to have to register
> with the site to check which data sheet it was.
>
> The 6809E need an external quadrature (90 degree phase shifted) clock, to
> generate E and Q signals which might be what you were referring to.
> Typically you use a 4 X clock and a dual JK flip flop to get the phasing
> right. The 6800 is a little different in that the clock signals are 180
> degrees out of phase and must not over lap i.e. the two phases should never
> be high at the same time.
>
> John.
>
> On 3/06/2012 2:36 PM, gene heskett wrote:
>> On Sunday, June 03, 2012 12:33:45 AM Computer Doc did opine:
>>
>>> Hi All,
>>>
>>>
>>>
>>> I recently ordered a couple of EF68B09P chips thinking their pinouts
>>> were the same as Motorola's MC68B09P chips.  I just downloaded the
>>> datasheet for it and they are very different, almost like their
>>> version of the 2MHZ 6809 used some of the original 6800 clock circuit
>>> specifications. Look at the pin labels.  They remind me of the 6800's
>>> pin labels.  What do you think? The following link is the one I used
>>> to get the datasheet:
>>>
>>>
>> The chip used in the coco's would be the MC6809EP, where the E means
>> external clock generation, and of course the P means the epoxyB
>> plastic case
>>> http://www.datasheetdirect.com/part/EF68B09P.html
>>>
>>>
>>>
>>> As you can see on page 13 (as Adobe reader counts it) and page 1-162
>>> (as it is printed in the PDF file, the clock circuit is quite
> complicated.
>>> Does anyone have a much simpler clock circuit using a 2 lead 8MHZ
>>> crystal or 4 pin 8MHZ Oscillator (metal case)?  Thanks guys in
>>> advance for your input. You all are always forthcoming with
>>> information.  I appreciate it.
>>>
>>>
>>>
>>> Kip
>>>
>>> Cheers, Gene
>
> --
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> http://members.optusnet.com.au/jekent
>
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