On Fri, 08 Jul 2005 23:30, Wouter van Ooijen wrote:
> > Have I managed to switch it out of LVP mode
> > (shouldn't be possible)
>
> have you enabled internal MCLR?
No.  I should now report that I got it to read & program (once), yet 
subsequent reads and attempts to get the chip identity now fail. 

....
Further testing reveals this: using either pikdev or picprg seem to mess up 
the chip so that it can no longer be programmed.  The chip needs a complete 
reset (power off, wait 30s, power on) before it will behave itself, only 
prog84 will then talk to it.  As these programs previously worked, I'm 
guessing that these two are allowing my program to briefly start* before 
going into program mode, which causes the hardware to act "strange".  Is this 
even possible?  I'll test by reflashing the chip tomorrow but it's late 
downunder now.

* the MCLR is only bought high by the programmer, not internally.

Michael Curtis

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