ATmega64A datasheet(92/392 Pages) ATMEL

92 / 392 page

8160C–AVR–07/09

ATmega64A

14. 8-bit Timer/Counter0 with PWM and Asynchronous Operation

14.1

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 OCF0)

• Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock

14.2

Overview

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

block diagram of the 8-bit Timer/Counter is shown in Figure 14-1. For the actual placement of

I/O pins, refer to “Pin Configuration” 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 106.

Figure 14-1. 8-bit Timer/Counter Block Diagram.

Registers

Timer/Counter

TCNTn

Waveform

Generation

OCn

= 0

Control Logic

= 0xFF

TOP

BOTTOM

count

clear

direction

TOVn

(Int. Req.)

OCn

(Int. Req.)

Synchronization Unit

OCRn

TCCRn

ASSRn

Status Flags

clk

I/O

clk

ASY

Synchronized Status Flags

Asynchronous Mode

Select (ASn)

TOSC1

T/C

Oscillator

TOSC2

Prescaler

clk

I/O

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