Hi,

I dont know if this would help you, but I did the design for a bootloader for a 17C756 a while ago.  See
http://www.workingtex.com/htpic, look under source code, then bootloader.

Cheers,
Shane.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Carlos Nieves Onega
> Sent: Monday, 19 March 2001 11:34 p.m.
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: 17C7xx icsp serial programming
>
>
> I previously send this message without the right tag. Sorry!.
> So I send you again this mail, with my programmer design, and my project
> design.
> Thanks to Douglas Wood for sending me his design, but I don't see any
> difference with mine, regarding to ICSP.
>
> Hi,
> I was working the last two months in an ICSP programming for 17c7xx
> series. (using a 17c756a)
> All I got is random behaviour from my PIC. Sometimes it "answered" my
> commands (but not correct), sometimes not. When it answered, the first
> command I send it was a read address command, and I got 0x8000 (only the
> last bit is wrong). I have read a previous message from Dave Roberts, in
> July, 2000, but it doesn't help me. I don't know if the specs from
> Microchip are right, (I think not).
> I have revised my design, voltages,... and they seemed to be right. The
> signals I send are as the Microchip spec, with the modifications which
> Dave Roberts posted (but I have tried too many ways), and I have checked
> and checked them with a logic analyzer... but I don't know what is the
> problem.
>
> Does anyone got a working ICSP for 17c7xx series?.
>
> Thank you in advance.
>
> Carlos Nieves
>
> P.D. I have modified the picprg2.2 programmer from Brian C. Lane (for
> Linux) so it can support more devices, but I can only try it with my
> 17c756a (which doesn't work). If anyone wants to try it, please, drop me
> an e-mail.
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