Hi,

I have two separate systems sharing same I2C-bus. System one have
16C74 and some I2C IC's. System two have some I2C IC's too and it also
contains I2C-bus pull-up resistors. System two starts up later than
system one. Problem is that I want to use I2C-bus in system one before
system two starts. It is difficult because pull-up's are located in
system two and they are not working until its supply starts.

I have planned to connect some RB pins parallel with SDA and SCL of
16C74 and use RB pull-up resistors as temporary I2C pull up's. After
system two starts those RB pull-up's can be programable switched off.
So, what do you think is that possible ? Any comments ?

----
Tero