STR9 as I2C 10-bit Master transmitter

johann2 · ‎2009-10-13

Posted on October 13, 2009 at 17:16

johann2 · ‎2011-05-17

Posted on May 17, 2011 at 09:59

Hi all,

I'm implementing on STR91 I2C communication with an I2C EEPROM.

The initialisation was done and I can send addresses and data to EEPROM but only in 7-bit Master transmitter/receiver mode.

Now I would like to use 10-bit Master transmitter/receiver mode but I can't find any information how to initialise I2C on STR91 in 10-bit mode.

In 10-bit Master mode STR91 have to send first a Header and after EV9 the Address. It sounds simple, but I never get the EV9 event and ADD10 bit is never set.

On my mind Header contains device code, 3 MSBits of address and R/W flag. Or I'm wrong?

Perhaps someone can help me to solve this problem.

Thanks!

Best Regards

Ivunin

tomas23 · ‎2011-05-17

Posted on May 17, 2011 at 09:59

Do you send a proper first address byte? Its format is 11110xxS, where XX are 8- and 9-th bits, S is R/\W. Read Philips I2C spec on the net, chapters 14 and 14.1.