[Coco] Hitachi HD63C09 Question

[Mark Marlette]

james,

Interesting!

Please do keep us posted on your project.

Mark

Quoting jdaggett at gate.net:

> MArk
>
> Going to interface to a Spartan 3 or 3E. The inputs and outputs are   
> not 5 volt
> tolerant. I can add some interface ICs or resistors. Preferably what  
>  would be nice
> is to have the 6309 operate at 3.3 to 3.6 VDC.
>
> I know that the 6309 is CMOS and was first designed in the mid 80's about the
> dame time the H C11 series came on the scene. I do know that the HC11's will
> operate between 3.3 and  5VDC. The EPROM OTA's will not program at 3.3 VDC
> though they will operate at 3.3VDC.
>
> I guess I will try it and see what happens. Let you know.
>
>
> james
>
> On 22 Jun 2007 at 9:50, Mark Marlette wrote:
>
>> james,
>>
>> Depending on the specfics of what you are trying to do. It depends.
>>
>> Most of the CPLDs/AVRs that we are now using at Cloud-9 are 3.3vdc.
>>
>> Most are 5v tolerant I/O and depending on what family you are
>> interfacing to requires you do either to pullup and have OC/OD outputs
>>  or nothing at all. Generally a white paper by the manufacture.
>>
>> Not sure on the Hitachi, that is on the 5vdc side of our designs.
>>
>> Good luck on your project.
>>
>> Regards,
>>
>> Mark
>> Cloud-9
>>
>> Quoting jdaggett at gate.net:
>>
>> > On 20 Jun 2007 at 22:00, George's Coco Address wrote:
>> >
>> >> Since you've asked this before and no one has replied, I would
>> >> assume that no one has tried it, or won't admit to it. It is an
>> >> interesting query.
>> >>
>> > **************
>> >
>> > KInd of why I am asking is I am working on a project that has a lot
>> >  of 3.3V logic. If the processor would run at that voltage then it
>> > would simplify   interfacing the processor to the rest of the
>> > circuit. I was just wondering if anyone
>> >  had tried before
>> > I did.
>> >
>> > james
>> >> ----- Original Message -----
>> >> From: <jdaggett at gate.net>
>> >> To: "coCoList for Color Computer Enthusiasts"
>> >> <coco at maltedmedia.com> Sent: Wednesday, June 20, 2007 8:41 PM
>> >> Subject: [Coco] Hitachi HD63C09 Question
>> >>
>> >>
>> >> >I know the Coco Community has used the Hitachi 6309 chip for a
>> >> >while. Most
>> >> > operation has centered around speeding up the 63C09E be yond
>> >> > 3MHz. I was wondering if anyone has experimented running the MPU
>> >> > at or below 2MHz and at 3.3VDC instead of 5VDC? IF the 63C09 was
>> >> > designed in the mid 80's then it is possible that at normal
>> >> > speeds the 63C09E just might run at 3.3VDC.
>> >> >
>> >> > Has anyone attempted or does anyone know of any tests done with
>> >> > lower VDC?
>> >> >
>> >> > james
>> >> >
>> >> > --
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>> >>
>> >>
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