I change the RB7 pin on the rising edge, and hold it while it transitions to the lowest edge. This ensures that it gets latched on the lowest edge. And yes, I am outputting Lsb first. Also, I raise MCLR from 0 -> 12V via a switch on my PSU, so that seems to be fast enough, doesn't it? And I will try taking a look at your code for the algorithm. Thank you


Jai


On Sun, Jul 21, 2002 at 07:30:25PM +0200, wouter van ooijen & floortje hanneman wrote:
> Are you outputting in the correct order (lowest bit first) and changing on
> the correct clock (I thing the PIC latches on falling), and did you put the
> PIC in program mode (MCLR rise fast enough).
>
> Wouter van Ooijen
> --
> Van Ooijen Technische Informatica: http://www.voti.nl
> Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen
>
>
> ----- Original Message -----
> From: Jai Dhar <jdhar@ENGMAIL.UWATERLOO.CA>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Sunday, July 21, 2002 11:45 PM
> Subject: [PIC]:
>
>
> > HI,
> >
> > I'm trying to code and make my own pic programmer for a 16f84. As a very
> simple starting point, I thought I would just try and write any command and
> read it back to verify it. So I follow this procedure:
> >
> > output 6 bits of 0x2 - 00 0010 (load program data)
> > output a start bit - 0
> > output 14 bits of any command
> > output a stop bit
> > output 6 bits of 0x8 - 00 1000 (cycle program command)
> > output 6 bits of 0x4 - 00 0010 (read program data command)
> >
> > After I issue the last command, I cycle the clock 16 times and monitor RB7
> for voltage changes, and I do'nt get anything. I know I'm sending/clocking
> RB6 and RB7 correctly because I have led's hooked up. What am I doing wrong?
> >
> > Thank you
> >
> > --
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> > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> >
> >
> >
>
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