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PICList Thread
'Strange UV Erase Problem'
1997\09\12@120623 by Lee Hewitt

picon face
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.

Many Thanks:  Lee Hewitt (Manchester ENGLAND)

1997\09\12@123615 by Clewer,Brian

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face
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.

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