ATMEGA2560 datasheet(37/449 Pages) ATMEL

Part #	ATMEGA2560

Description	8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash

PDF	449 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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37 / 449 page

ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

System Clock and

Clock Options

This section describes the clock options for the AVR microcontroller.

Overview

Figure 20 presents the principal clock systems in the AVR and their distribution. All of

the clocks need not be active at a given time. In order to reduce power consumption, the

clocks to modules not being used can be halted by using different sleep modes, as

described in “Power Management and Sleep Modes” on page 50. The clock systems

are detailed below.

Figure 20. Clock Distribution

General I/O

Modules

Asynchronous

Timer/Counter

CPU Core

RAM

clk

I/O

clk

ASY

AVR Clock

Control Unit

clk

CPU

Flash and

EEPROM

clk

FLASH

Source clock

Watchdog Timer

Watchdog

Oscillator

Reset Logic

Clock

Multiplexer

Watchdog clock

Calibrated RC

Oscillator

Timer/Counter

Oscillator

Crystal

Oscillator

Low-frequency

Crystal Oscillator

External Clock

ADC

clk

ADC

System Clock

Prescaler

ATMEGA2560 Datasheet(PDF) 37 Page - ATMEL Corporation

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