ATtiny44 datasheet(69/236 Pages) ATMEL

69 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

11. 8-bit Timer/Counter0 with PWM

11.1

Features

• Two Independent Output Compare Units

• Double Buffered Output Compare Registers

• Clear Timer on Compare Match (Auto Reload)

• Glitch Free, Phase Correct Pulse Width Modulator (PWM)

• Variable PWM Period

• Frequency Generator

• Three Independent Interrupt Sources (TOV0, OCF0A, and OCF0B)

11.2

Overview

Timer/Counter0 is a general purpose 8-bit Timer/Counter module, with two independent Output

Compare Units, and with PWM support. It allows accurate program execution timing (event man-

agement) and wave generation.

A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 11-1 on page 69. For

the actual placement of I/O pins, refer to Figure 1-1 on page 2. 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 loca-

tions are listed in the “Register Description” on page 80.

Figure 11-1. 8-bit Timer/Counter Block Diagram

Clock Select

Timer/Counter

OCRnA

OCRnB

TCNTn

Waveform

Generation

Waveform

Generation

OCnA

OCnB

Fixed

TOP

Value

Control Logic

= 0

TOP

BOTTOM

Count

Clear

Direction

TOVn

(Int.Req.)

OCnA

(Int.Req.)

OCnB

(Int.Req.)

TCCRnA

TCCRnB

Edge

Detector

( From Prescaler )

clk

ATtiny44 Datasheet(PDF) 69 Page - ATMEL Corporation

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