I2CWRITE/I2CREAD access hardware in the different way? (PCA9685 issues)

[CuriousOne]

Chip is 18F45K80. I changed pull-up values to 5.1K, not much difference in shape of signals, but at least now it works.
So in case of I2CWRITE, pins should be configured as input?

[tumbleweed]

You should probably leave them as inputs.

The I2C commands will change them from inputs to outputs as required to simulate an open-collector signal (high=input, low=output 0).

It would probably work as outputs too, but there would be a period of time where the lines were being actively driven until the first I2C command, so better to have them as inputs.