Programming 8-bit PIC Microcontrollers in C

3.6. PIC16 C I²C Serial Bus

• I²C simulation test system

• I²C control, address, and data bytes

The inter-integrated circuit (I²C) synchronous serial bus provides a means of exchanging data between peripheral devices and microcontrollers using software addressing. This means that only two signals are required, data and clock (see Section 1.4 for details).

The test system shown in Figure 3.9 has only one I²C peripheral device, the 24AA256 serial flash memory chip, to keep it as simple as possible. Serial memory is a common feature of applications that require additional data storage, such as a data logger. It allows the internal EEPROM of the PIC to be expanded using only two I/O pins. The downside is that the memory access is rather slow, with ...