Subject:
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Re: HB Serial line speed change
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 24 Jul 1999 20:10:29 GMT
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Original-From:
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Chuck McManis <cmcmanis@mcmanisSPAMCAKE.com>
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Viewed:
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764 times
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At 03:43 PM 7/23/99 +0200, Martin Frischherz wrote:
> I'm asking this again, since I've got no definitive answer:
> Is it possible to change the speed of the HB serial line to 19200?
> I need to communicate with a device which has a fix 19200 setting!
The definitive answer comes from the "pink" book, which everyone should
have (especially now that you can get it on CD-rom for free by filling out
the form on the Mot web site!) Which basically says "No you can't do that."
But it says it in a somewhat confusing way.
The baud rate of the SCI is controlled by 5 bits in the "BAUD" register
(address $102B). Bits 4 and 5 set the prescaler, and then 0 thru 2 set the
baud rate. With an 8Mhz clock you can set the prescaler to produce as a top
baud rate either 125K, 41.67K, 31.25K, or 9600. Then with the lower three
bits you can divide that top rate by 1 through 8 (so anything smaller in
increments of 1/2 up to 8 times) [For you music fans the Handboard can be
programmed for 31.5K with is the MIDI standard rate]
To get 19.2 you need run the board at 10Mhz which you can't do with the
handyboard.
--Chuck
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Message has 1 Reply:
 | | Re: HB Serial line speed change
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| (...) I haven't looked at the schematics for the handyboard for a while, but if you use an E-series processor, then I think you can go up to 12MHz (3 MHz E-Clock). I'm not sure whether the rest of the Handyboard could take the increased speed, and (...) (25 years ago, 26-Jul-99, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | HB Serial line speed change
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| Hi! I'm asking this again, since I've got no definitive answer: Is it possible to change the speed of the HB serial line to 19200? I need to communicate with a device which has a fix 19200 setting! Is it possible or can I forget the HB for this (...) (25 years ago, 23-Jul-99, to lugnet.robotics.handyboard)
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