The inter-integrated circuit (I2C, I2C, or IIC) module provides a method ofcommunication between a number of devices.The interface is designed to operate up to at least 400 kbit/s with maximum bus loadingand timing. The I2C device is capable of operating at higher baud rates, up to a maximumof clock/20, with reduced bus loading. The maximum communication length and thenumber of devices that can be connected are limited by a maximum bus capacitance of400 pF. The I2C module also complies with the System Management Bus (SMBus)Specification, version 2.21.2.1 FeaturesThe I2C module has the following features:• Compatible with The I2C-Bus Specification• Multimaster operation• Software programmable for one of 64 different serial clock frequencies• Software-selectable acknowledge bit• Interrupt-driven byte-by-byte data transfer• Arbitration-lost interrupt with automatic mode switching from master to slave• Calling address identification interrupt• START and STOP signal generation and detection• Repeated START signal generation and detection• Acknowledge bit generation and detection• Bus busy detection• General call recognition• 10-bit address extension• Support for System Management Bus (SMBus) Specification, version 2• Low power mode wakeup on slave address match• Range slave address support• Double buffering support to achieve higher baud rate21.2.2 Modes of operationThe I2C module's operation in various low power modes is as follows:• Run mode: This is the basic mode of operation. To conserve power in this mode,disable the module.IntroductionMC9S08SU16 Reference Manual, Rev. 5, 4/2017362 NXP Semiconductors
