Contents

Introduction I2C Specification I2C Module Overview Dedicated Transmit/Receive Buffers Address Buffers Receive Buffer Transmit Buffer Start Condition Repeated Start/Restart Condition Acknowledge (ACK)/Not Acknowledge (NACK) Sequence Stop Condition SDA and SCL Pins Bus Time-Out Data Byte Count Interrupts for Address Match, Transmit Buffer Empty, Receive Buffer Full, Bus Time-Out, Data Byte Count, Acknowledge, and Not Acknowledge I2C Master Mode Operation Master Clock Timing Bus Free Time Master Mode Configuration and Operation Initialization Master Mode Transmission Master Mode Reception External Pull-up Resistor Selection Conclusion The Microchip Web Site Customer Change Notification Service Customer Support Microchip Devices Code Protection Feature Legal Notice Trademarks Quality Management System Certified by DNV Worldwide Sales and Service