Sources of ISCP problems (was 16f84 Question)
wouter van ooijen & floortje hanneman email (remove spam text)
> Did I read in a thread recently that a fast starting oscillator is also a
> potential problem? Should I ground the OCS1 while programming?
That's the vcc to vpp rise: you can get away with a slow rise when it does
not 'span' more than X clock cycles.
> I'm guessing I don't need to tie LVP low if I'm using HVP, correct?
Might work, might not work. Better be safe than sorry.
> How about breadboards? Since I'm just starting out, most of my work is
> these. Since I've read here that they are 'big capacitors', is this also
> source of problems? Even if no other part of the circuit is connected to
> and RB7.
I never found that a problem. A few 10's of pf is not what I would call big.
> Finally what about the programmer? Once ISCP programmer I've tried works
> 10% of the time, on 16F84A and 16F628 parts always in HVP mode. I
> a ICD, on the same breadboard, same MCLR > 10K R > VCC, it works 100%
> the time on 16F87x parts. Maybe the inconsistent programmer is getting
> the oscillator issue (I'll go try that now)?
Wouter van Ooijen
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