24.3 I2C System Overview

The I²C module contains an independent I²C host logic and an I²C client logic, which generates interrupts based on their events. In the multi-host systems, the user software is simply partitioned into the host controller and the client controller.

When the I²C host logic is active, the client logic also remains active, detecting the state of the bus and potentially receiving messages from itself in a single-host system or from the other hosts in a multi-host system. No messages are lost during the multi-host bus arbitration.

In a multi-host system, the bus collision conflicts with the other hosts in the system when detected, and the module provides a method to terminate and then restart the message.

The I²C module contains a Baud Rate Generator (BRG). The I²C BRG does not consume other timer resources in the device. Figure 24-4 illustrates the I²C module block diagram.