I am going to use a 400 kHz I2C bus, but I want to talk to a slave MCU, a PIC16F690 ([datasheet](http://ww1.microchip.com/downloads/en/DeviceDoc/41262C.pdf)), running at 32 kHz. Is it possible to do this? I think so, because the master does the clocking, but are there any unforeseen problems that might occur? (e.g. MCU can't load data into RAM quick enough.)