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load osccal register

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chava

Joined: 07 Sep 2003
Posts: 56

load osccal register
Posted: Sun Feb 22, 2004 1:35 am

Hello I have a pic 16f630 I know that every time the pic is programmed, the calibration word erases. I want to prevent it. since this is a manufacturing process, I can't check each pic's calibration word. how can I do that?

Felix Althaus

Joined: 09 Sep 2003
Posts: 67
Location: Winterthur, Switzerland

Posted: Sun Feb 22, 2004 3:54 am

Reply with quote

Hi

Quote:

I know that every time the pic is programmed, the calibration word erases.

Thats not exactly true.If you tell the programmer not to programm the last program memory address the osccal value will be still there (if the chip wasn't erased before, I think a few programmers do that before programming)
The other calibration value are the two bandgap bits in the config word but I don't know if you can only program specific config bits.

Wouldn't it be possible to first read the whole pic, extract the calibration constants and then program it?

Felix

chava

Joined: 07 Sep 2003
Posts: 56

canot
Posted: Sun Feb 22, 2004 7:41 am

tank you

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