AVR Application notes

Atmel AVR 8-bit and 32-bit Microcontrollers

http://www.professordan.com/avr/techlib/techlib8/appnotes/

2004-11-19

AVR319: Using the USI module for SPI communication This application note describes a SPI interface implementation, in form of a fullfeatured driver and an example of usage for this driver.

2005-09-08

AVR310: Using the USI module as a I2C master This Application Note describes how to use the USI for TWI master communication.

2005-12-13

AVR312: Using the USI module as a I2C slave This Application Note describes how to use the USI for TWI slave communication.