Subject:
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Re: Pic16c84 programming with Handyboard
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 5 Nov 1996 16:21:59 GMT
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Original-From:
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David Negro <dln2@cornell.edu#Spamless#>
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Viewed:
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2128 times
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David,
Althuogh I don't have an expansion board either, I am in the middle of
testing some code that I wrote to program pi16c84s. Everything seems to be
working well, I just want to keep on testiong it before releasing it. I
wrote it such that it can be easily modified such that anyone with a 6811
(including the expansion board) can program pic16c84s without difficulty no
matter what computer platform is being used.
Fred, While working on this project I looked at your schematic for creating
the 12V programming voltage on the expansion board. You used a MAX chip if
memory serves. I looked up the spec sheet for the MAX part and noticed
that the rise time of the 12V is much larger than that required for getting
the pi16c84 into program/verify mode. I am no analog genius, so I need
some way to do this quickly. I modified my board so that I could
disconnect my batteries, so I should have 12V on my board already from the
wall transformer (as long as I put the charger into Zap mode). Right now I
am using a simple transistor switch to control the programming voltage, but
if anyone has a better suggestion, I am up for it.
Also, since I am just getting into PICs myself, if anyone has any simple
16c84 code that I could use to test my programmer with, it would be great.
I already have a simple LED flasher going, but some other tests would be
nice.
-Dave Negro
dln2@cornell.edu
> I have got a little question about the expansion board: at the HB
> home page, I
> could read that the exp. board was not yet finished and that the
> programming of the
> PIC16C84 is impossible. In fact, I did not found any layout of the two
> layers of the PCB,
> without silkscreen. Can anybody help me?
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Message has 1 Reply:
 | | Re: Pic16c84 programming with Handyboard
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| David -- The MAX662 chip I used on the last beta rev was not the magic bullet I hoped. Not only is there possibly the rise time problem you mention, but when the thing turns off, it outputs 5v. The PIC needs a swing from 0v to 12v to enter program (...) (28 years ago, 5-Nov-96, to lugnet.robotics.handyboard)
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