Subject:
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Re: handyboard clock speed
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 23 Apr 1999 19:36:45 GMT
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Original-From:
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Fred Martin <FREDM@stopspammersMEDIA.MIT.EDU>
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Viewed:
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858 times
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> I think this is how it works: The HC11 starts downloading at 1200 baud
> currently, and then switches to 9600 after getting the little 200-odd byte
> downloader into the chip and running. I'm not sure, but I think the chip
> would start at 1800 baud for the first 200-odd bytes and then those
> 200-odd bytes that get loaded into the chip might need to be tweaked to
> put the chip at a standard baud rate for the rest of the download.
yes, this is right.
the fastest you can go with the 52-pin 6811s is 12 MHz crystal --> 3 MHz
system clock (i'm pretty sure). so this is only 1.5x over the stock HB.
so you've got the issue Curt pointed out with not only the downloader,
but also with IC.
so unless you're willing to work from the source code of these tools, to
deal with the baud rate issue, basically, you're wedged.
in my opinion: 1.5x speedup = lots of hassle = not worth it.
if you need more speed, write in assembly (maybe using IC's ICB
interface), or use ImageCraft's icc11 (www.imagecraft.com) native C
compiler. OR, give a try to Kurt Konolige's "IC Native" port of the
freeware Interactive C. see
<http://el.www.media.mit.edu/projects/handy-board/software/icsource.html>
yours
fred
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Message has 1 Reply:
 | | Re: handyboard clock speed
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| (...) Not going to mention the free Otto/Steven/Keith/Curt GCC-2.8.1 HC11 port? I'm hurt. ;-) Maybe you need to add my web & ftp pages to your free software page, now that I have a GCC Handyboard library available? GCC/HC11 patches are available (...) (25 years ago, 23-Apr-99, to lugnet.robotics.handyboard)
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