Subject:
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Re: 68hc11F1
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 28 Jul 1998 13:41:13 GMT
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Original-From:
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Remi Desrosiers <harlock@videotron.caSTOPSPAM>
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Viewed:
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942 times
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At 09:12 7/28/98 +0200, you wrote:
> Hello Mike,
>
> Sorry for the cryptical message,
>
> I don't have a handyboard running at 16 Mhz, i made my own board,
> currently with a 68hc11F1(@16Mhz), 32 K external RAM, 32k External
> flash. My programs are run from the flash, leaving aprox 32 k of stack
> and heap. I also have a 50 pin header, to connect several other boards.
> On this connector i have connected 2 * 4K of IO space, with chip select
> lines. So i have 32k - 8k - 1k left for stack and heap. On this 2 * 4k
> io space i'm designing a servo board, for rc hobby servos, 16 in total
> with just 2 ICs. Another board i'm designing are H-bridges for 3 DC
> motors. I'm thinking of designing 3 PIC micro's for the PID interface as
> well as the encoder stuf and PWM stuf, and just interface to the PIC
> with giving positions to move to and a start signal.
For the H-bridges look for the LMD18200T at http://www.national.com/catalog
There's also the LM689 for motion control, using PWM as output and
quadrature encoder (4bits?) as input. However I think the command that must
be sent are 8 parallel bits :(
>
> Hope this clarifies things.
>
> If you want more information please email me, I will put it on my
> homepage.
>
> Regards Richard.
> Email rjc.meester@wxs.nl
> http://home.pi.net/~rmeester
.-------------------------- . . .
| Remi Desrosiers
| "My Youth in Arcadia" ICQ# 7228856
| harlock@videotron.ca
. remi.desrosiers@polymtl.ca
.
.
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