ATtiny167 datasheet(87/282 Pages) ATMEL

87 / 282 page

7728D–AVR–07/09

ATtiny87/ATtiny167

10. 8-bit Timer/Counter0 and Asynchronous Operation

Timer/Counter0 is a general purpose, single channel, 8-bit Timer/Counter module. The main

features are:

10.1

Features

• Single Channel Counter

• Clear Timer on Compare Match (Auto Reload)

• Glitch-free, Phase Correct Pulse Width Modulator (PWM)

• Frequency Generator

• 10-bit Clock Prescaler

• Overflow and Compare Match Interrupt Sources (TOV0 and OCF0A)

• Allows Clocking from External Crystal (i.e. 32 kHz Watch Crystal) Independent of the I/O Clock

10.2

Overview

Many register and bit references in this section are written in general form.

• A lower case “n” replaces the Timer/Counter number, in this case 0. However, when using

the register or bit defines in a program, the precise form must be used, i.e., TCNT0 for

accessing Timer/Counter0 counter value and so on.

• A lower case “x” replaces the Output Compare unit channel, in this case A. However, when

using the register or bit defines in a program, the precise form must be used, i.e., OCR0A

for accessing Timer/Counter0 output compare channel A value and so on.

A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 10-1. For the actual

placement of I/O pins, refer to “Pin Configuration” on page 5. CPU accessible I/O Registers,

including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit

locations are listed in the “8-bit Timer/Counter Register Description” on page 100.

ATtiny167 Datasheet(PDF) 87 Page - ATMEL Corporation