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I think, I have a little knot in understanding the i2c-timing....

I use the 16F876 and the 18F4585 for communication over i2c to a 16F872.

I read the documentation, and there is written, the speed of i2c is 
defined by Fosc/4/(SSPADD+1). (chapter 9.2.8 in PIC16F876-manual)
So, using a 4MHz resonator, I should load the value 9 to SSPADD to 
achive a speed of 100khz

But they say, the BRG-Register is reloaded by SSPADD and decremented 
twice a Fosc...
Or they say, the I2C-clock is OSC/4(SSPADD+1) (chapter 9.2 in 
pic16f876-manual or chapter 17.4.2 in pic18f4585-manual).
Or they use the double Fosc (chapter 17.4.7 in pic18f4585-manual) and 
achive 400kHz clockspeed with an SSPADD of 0Ah (table 17-3 in 
pic18f4585-manual)


So,
who is right ????

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