> Matthew Twomey wrote:
>
> > Is there a way to determine the silicon revision on an 18F252 w/o reading
> the config address (3ffffe)?
>
>
> Hi Matthew,
>
> Take a look at the newer PIC18F errata documents. Microchip is associating
> silicon revision #s with data codes, but I feel it would be far better if
> one just reads the silicon revision from the chip (DEVICE ID REGISTER 1) --
> then you know exactly what you have. You could easily send the silicon
> revision out the serial port for analysis if you want (mask the lower 5 bits
> and format it within the PIC and then send out the serial number in ASCII,
> for example). Very simple, very easy.
>
> Hope this helps.
>
> Best regards,
>
> Ken Pergola

Thanks Ken,

The 18F252 errata sheets don't contain this information (I know the errata
sheets for some PICs do). I agree the the most reliable way is to read it
from the chip and this is indeed the way I do it. But in order to do that,
I have to program the pic, read it, then reprogram it with my app. I
dislike the idea of leaving the code to read the silicon rev in my final
application.

This is a minor complaint and not a big problem. I was just wondering if
the revision information was out there somewhere w/o reading the chip. I
wish Microchip would maintain a datecode-to-rev document for each device
on their website.

-Matt

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics