AVR4013 Datasheet, PDF (1/7 Pages) ATMEL Corporation – Sleep modes PRR registers Oscillator calibration USART

AVR4013: picoPower Basics
Features
• Sleep modes
• PRR registers
• Oscillator calibration
• USART
8-bit
Microcontrollers
1 Introduction
In this demonstration we will show you how to extend the battery life of our
application by multiple factors by modifying only the firmware. You will see that
while some of the modifications are very simple and only require setting some
registers, other modifications will need some rewriting of the code.
We will use a capacitor as a battery in this demonstration because it is easy to
recharge with the same amount of energy. We will use the discharge time as a
measure of power consumption.
Our demonstration application will do one ADC measurement, perform 1000 cycles
worth of processing, and send the string “More oomph to your amps, picoPower!”
and the iterations count on the UART. This will be repeated each second. Before
reading this application note, you should download the datasheet for the
ATmega88PA from
http://www.atmel.com/dyn/resources/prod_documents/doc8271.pdf
Application Note
Figure 1-1. Demonstration application
Rev. 8349A-AVR-11/10