This is a software emulation of the I2C-bus by using two general purpose timers of a microcontroller from the C166 family. The I2C-bus is used in many applications mainly to communicate between devices connected to the bus.1 Introduction to I2C-bus 32 I2C-bus Specifications 32.1 Data Transfer Formats 32.2 Timing Diagram 62.3 Hardware Connection 83 Software Des cription 93.1 Software Concept 93.2 Des cription of Module Subroutines 103.3 Software Compilation 15