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I2C addressing gap on 18F4680

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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sat Mar 08, 2008 11:04 am

Reply with quote

Quote:

As far as I interpret all the documentation the slave address 0x00 is
reserved for a general call (I assume 0x01 being the "write to master"
then), and all slave addresses from 0x02 up can be used as a valid slave
address
I've tried address from 0x02 upto and including 0x0e, no avail.

Download the i2c bus specification (vs. 2.1):
http://www.nxp.com/acrobat_download/literature/9398/39340011.pdf
In CCS terminology, 8-bit slave addresses of 0x02 to 0x0E are the
same as the following 7-bit addresses in Philips terminology.

Code:

CCS: i2c spec:
0x02 0000 001
0x04 0000 010
0x06 0000 011
0x08 0000 100
0x0A 0000 101
0x0C 0000 110
0x0E 0000 111

Look at Table 2 on page 16 of the i2c spec. Every one of those
addresses is reserved.

peter273

Joined: 07 Mar 2008
Posts: 5


Posted: Sat Mar 08, 2008 2:06 pm

Jeeeses..... Thanks PCM, there's something I indeed flagrantly missed Guess I missed those few trees with the rest of the wood standing in the way

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