ATMEGA640 datasheet(115/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

16. 8-bit Timer/Counter0 with PWM

16.1 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)

16.2 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 management) and wave generation.

A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 16-1. For the actual placement of I/O pins,

refer to “TQFP-pinout ATmega640/1280/2560” 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 locations are listed in the “Register Description” on

page 126.

Figure 16-1. 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

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