ATXMEGA64A1 datasheet(20/99 Pages) ATMEL

20 / 99 page

8067I–AVR–04/09

XMEGA A1

Figure 10-1. Clock system overview

Each clock source is briefly described in the following sub-sections.

10.3

Clock Options

10.3.1

32 kHz Ultra Low Power Internal Oscillator

The 32 kHz Ultra Low Power (ULP) Internal Oscillator is a very low power consumption clock

source. It is used for the Watchdog Timer, Brown-Out Detection and as an asynchronous clock

source for the Real Time Counter. This oscillator cannot be used as the system clock source,

and it cannot be directly controlled from software.

10.3.2

32.768 kHz Calibrated Internal Oscillator

The 32.768 kHz Calibrated Internal Oscillator is a high accuracy clock source that can be used

as the system clock source or as an asynchronous clock source for the Real Time Counter. It is

calibrated during production to provide a default frequency which is close to its nominal

frequency.

32 MHz

Run-time Calibrated

Internal Oscillator

32 kHz ULP

Internal Oscillator

32.768 kHz

Calibrated Internal

Oscillator

32.768 KHz

Crystal Oscillator

0.4 - 16 MHz

Crystal Oscillator

2 MHz

Run-Time Calibrated

Internal Oscillator

External

Clock Input

CLOCK CONTROL

UNIT

with PLL and

Prescaler

WDT/BOD

clkULP

RTC

clkRTC

EVSYS

PERIPHERALS

ADC

DAC

PORTS

...

clkPER

DMA

INTERRUPT

RAM

NVM MEMORY

FLASH

EEPROM

CPU

clkCPU

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