Some(lots) PIC16XXX devices will not run above 4 MHz.  Unless you have the
EProm version you will have to scrape off the label and look for the suffix
at the end of the part number.  All PIC EProms (as far as I know) will run
at 20 MHz.

Also make sure that HS is selected on the programming configuration.


At 12:44 PM 2/11/99 -0800, you wrote:
>At 14:23 02/11/99 +0000, Lloyd Verhage wrote:
>>> Describe your device.  Is it a 4 pin, 14pin DIP size thing?  Then in this
>>> case, its a TTL oscillator, not a pure crystal.  How is it wired up....if it
>>> is an oscillator?
>>
>>Its a 28 pin dip.  The problem is that the label covers the IC, so I
>>can only make out the 16C part of it.
>
>i think he was talking about the possibility that your "crystal" might be a
>complete oscillator (there are some out there like he described: 14pin dip
>size, with only the pins 1,7,8,14).
>
>if it's actually a crystal (usually a 2pin metal case), you need the
>approx. 20pF caps somebody else mentioned. if it's a resonator (usually
>3pin and not metal), it might or not have the caps built in (if it hasn't,
>you need them, too). if it's an oscillators like the above mentioned it
>needs a connection to the power supply.
>
>ge
>