Hi,
if the XTAL does not exceed 4MHz, you should select XT config. instead of
HS.

Imre


On Mon, 9 Aug 1999, PC Pete wrote:

> Greetings all,
>
> This is my first post, and I realise this question must have been asked
> before, but I haven't seen it.
>
> I have a slightly not working 16F84 controller, and I'm buggered as to
> why it slightly doesn't work. If anyone's done the same things and had
> the same problems, I'd be delighted to hear your thoughts.
>
> I purchased and built a DT001 PIC programmer, courtesy of Don Mc. I
> also purchased and populated a DT 111, then powered up and checked that
> I didn't let the smoke out of anything. Using Nigel's lovely PIC
> programming software, including the 32-bit port driver, on my shiny new
> notebook, I apparently managed to program the 16F84 enough to run Don's
> Walking LEDs test. Sometimes. There's the rub.
>
> If, after programming the PIC (socketed in the machined sockets on
> either the '001 programmer itself, or installed in the '111 SIMMSTIK in
> SIMM socket 0, then transferred to the '111 socket), I switch from
> 'Load' to 'Run', sometimes it runs the walking LEDs. Otherwise it sits
> there with a bunch of random LEDs glaring at me. Pressing either the
> 'Boot' or 'Reset' buttons does nothing. Or if it does something, I
> can't see what it is.
>
> Using Nigel's software, I can erase, program, and verify the PIC till
> I'm blue in the face, in either of the allowed programming sockets. But
> then either it will work, or it will not work.
>
> If I now take the partially not-working PIC and plug it into any other
> socket (including Don's '004 "short" board, this now completely fails
> to work.
>
> I don't have MAX232 installed in the programmer or the '111. I'm
> communicating parallel-ly.
>
> I have a clean supply of 19V AC rated at 3.5A. (40KHz switchmode from
> mains,  <10mV  @ 10k,20k, & 40KHz)
>
> I do have stable 5V (4.98V, 20-60mV ripple @50 & 100 Hz, fully loaded
> (1.01A, using calibrated HP resistors)) at the regulator. I also have
> it at the other end of the board :)
>
> 13V DC under normal programming load is stable and reasonably quiet
> (12.71V, 60-110mV ripple @50&100Hz).
>
> The program is set up for HS (I'm using the furnished Xtal, with
> appropriate trimcaps (18pF)). At power on I get a very nice waveform
> centered at about VDD/2, no noise, no spikes, no dropouts.
>
> SIMM sockets are tight, board edge tinning is good, no dry joints
> between here and Casablanca.
>
> I'm an ex-Z80 lover who wants to get into the slightly simpler and
> friendlier world of the PICs before my eyesight goes completely.
> Luckily, my wife (She Who Must Be Obeyed) also wants me to get the PIC
> running, too, so I can prove I haven't just dashed the Nursery
> Decorating Money on Something Else That Doesn't Work.
>
> I'm pretty sure the PIC is healthy and happy - what have I missed?
>
> Apologies for the digital diarrhoea, I didn't want to just post "it
> doesn't work" and have 2 dozen "what about the..." enquiries. If I
> _have_ missed something, please let me know!
>
> Thanks for your patience!
>
> Regards,
>
> Peter
>
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