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young
Joined: 24 Jun 2004
Posts: 285
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| difference between 12f675 E/P 253 and E/P06R |
 Posted: Tue Aug 03, 2004 3:01 pm |
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| I used 12f675 E/P05R for serial communication successfully, but the same program could not work on e/p253, I was using internal crystal 4mHz, what mightbe wrong? |
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Ttelmah
Guest
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| Re: difference between 12f675 E/P 253 and E/P06R |
| Posted: Wed Aug 04, 2004 6:34 am |
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| young wrote: | | I used 12f675 E/P05R for serial communication successfully, but the same program could not work on e/p253, I was using internal crystal 4mHz, what mightbe wrong? |
Can you put up the whole part number, in the exact 'layout', that it occurs on the PIC?. So something like:
12F675
E/P05R
(M)H24
I am worried by the code you give for the second part. A 3 digit code on the second line, is _not_ a normal 'retail' PIC, but is a OTP part programmed at the factory. If this is what you have, it can never be used for anything but it's original purpose, which is why it won't run for you.
Perhaps it has been taken out of a piece of mass production kit?.
Also as a 'comment', there is _not_ a crystal oscillator in the PIC. It is a RC oscillator, 'trimmable' by the OSCCAL value.
Best Wishes |
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young
Joined: 24 Jun 2004
Posts: 285
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| Posted: Thu Aug 05, 2004 2:22 pm |
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it was
12f675
e/p253
0345
and
12f675
e/p05R
0405
I do figured out what is wrong with my programming, It was because OSCCAL Value was erased somehow.
I would like very much to know the difference between these two chips if possible.
Thanks |
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dyeatman
Joined: 06 Sep 2003
Posts: 1912
Location: Norman, OK
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| Send the question to Microchip |
| Posted: Thu Aug 05, 2004 3:03 pm |
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| You need to send that question to Microchip! |
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