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How do I write an ID and read ID from a chip?

 
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cchappyboy



Joined: 03 Dec 2008
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How do I write an ID and read ID from a chip?
PostPosted: Mon Nov 16, 2009 12:11 pm     Reply with quote
How do I use #ID to write an ID to a chip?
#ID 0x1234
#ID "serial.num" : Is that means When I write ID to a chip the program find serial number in file "serial.num" and write into it?
#ID CHECHNUM

Where did ID number locate? in EEPROM or special location like configuration memory 2007h.

How do I read this id?

Any concern for this question I appreciate here in advance.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 16, 2009 2:39 pm     Reply with quote
Post your PIC.
cchappyboy



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PostPosted: Mon Nov 16, 2009 3:58 pm     Reply with quote
that is pic16f876
PCM programmer



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PostPosted: Mon Nov 16, 2009 4:19 pm     Reply with quote
The 16F876 data sheet says this:
Quote:

12.16 ID Locations
Four memory locations (2000h - 2003h) are designated
as ID locations, where the user can store checksum or
other code identification numbers. These locations are
not accessible during normal execution, but are readable
and writable during program/verify. It is recommended
that only the 4 Least Significant bits of the ID
location are used.

16F876 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/30292c.pdf

More information is available in the 16F876 Programming Guide:
http://ww1.microchip.com/downloads/en/DeviceDoc/39025f.pdf
Look in this section:
Quote:
2.3 ID Locations


The CCS manual has a section on the #ID directive.
See page 101 (page 113 in the Acrobat reader):
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf

The following CCS example file shows how to use the #ID directive:
Quote:
c:\program files\picc\examples\ex_checksum.c
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