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PICList Thread
'[PIC]: Y2K bug (?) on 16F877???'
2001\01\12@020457 by dr. Imre Bartfai

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Hi,

I have a Tait'style programmer and the P16PRO programming software. Until
recently I could program all of PICS could be programmed in serial
mode. However, for 16F877's having mfg date 2000 I can only program if I
touch the leads transferring signals to the PICs (I have a relatively high
conductance, compared to other persons). The PIC is on a separate
breadboard, and the programmer is connected to it with a 5-wire flat
cable (20 cm). Did the programming spec perhaps change? Any ideas?

Regards,
Imre

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'[PIC]: Y2K bug (?) on 16F877??? (fwd)'
2001\01\18@073619 by dr. Imre Bartfai

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Hi,

I asked the question below about a week. Maybe it captured nobody's
attention so I kindly ask once more (and last). The problem have another
colleagues also.

Regards, Imre


Hi,

I have a Tait'style programmer and the P16PRO programming software. Until
recently I could program all of PICS could be programmed in serial
mode. However, for 16F877's having mfg date 2000 I can only program if I
touch the leads transferring signals to the PICs (I have a relatively high
conductance, compared to other persons). The PIC is on a separate
breadboard, and the programmer is connected to it with a 5-wire flat
cable (20 cm). Did the programming spec perhaps change? Any ideas?

Regards,
Imre

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2001\01\18@084919 by Simon Nield

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imre:
>cable (20 cm). Did the programming spec perhaps change? Any ideas?

have not suffered from any problems myself, but am not using the same setup.

might be worth checking the faq to see if you are doing anything suspect with your connections
(thinking of the nasty rb3 problem for instance).

the faq:
http://www.piclist.com/techref/microchip/index.htm

stuff about rb3 ("Can't program 16f8xx in traditional high voltage programmer?" from faq):
http://www.piclist.com/techref/microchip/index.htm

some misleading stuff I wrote a while back ("Programming modes" from faq):
http://www.piclist.com/techref/microchip/16F877/progmodes.htm

hope this helps,
Simon

p.s. could be that no one answered because the subject was a bit misleading ?

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2001\01\18@104311 by jamesnewton

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Simon, what you wrote was a very accurate and instructive look at how the
datasheets are misleading... You were saying "the datasheets would appear to
say X" which is true and then Jim's findings are the "but the reality is Y".
I've left it up because it shows what can happen without A) Distrust of the
documentation <GRIN> B) real world reality testing and C) a community of
people to share results with. A very valuable thing to see.

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