Lee wrote:)

>Hi all,
>         Could someone please tell me how long I should expose the windowed
>PIC 16C65 for, since I have been experiencing problems whereby the device
>checks out as being blank but when I select program, the programming
process
>takes a much shorter time than usual. Then after programming if I select
read
>device, then the program memory window only displays the labels in my
>program, all the other locations being clear ?. If I then select program
>again, then the I get the device is not blank message saying that the ID's
>are set, however I can still program the device at this stage and upon
>completion the program memory window displays the correct data content ?. I
>have been exposing the PIC 16C65 for between 10 and 15 minutes using a low
>cost UV eraser which I purchased from Digi-Key. This is the first time I
have
>used any UV type devices; I have previously only ever used the PIC 16C84
>EEPROM type device.


Are you eraseing the device and then trying to program the part straight
after?  If so I would wait a few minutes for the pic to 'cool down' before
you program it.

Brian.