ATXMEGA192D3-MH View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA192D3-MH

8/16-bit XMEGA D3 Microcontroller

Atmel Corporation 

XMEGA D3

Figure 9-1. Clock system overview

32 kHz ULP

Internal Oscillator

32.768 kHz

Calibrated Internal

Oscillator

clkULP

WDT/BOD

clkRTC

RTC

2 MHz

Run-Time Calibrated

Internal Oscillator

32 MHz

Run-time Calibrated

Internal Oscillator

32.768 KHz

Crystal Oscillator

PERIPHERALS

ADC

CLOCK CONTROL

UNIT

with PLL and

Prescaler

clkPER

PORTS

...

INTERRUPT

EVSYS

RAM

0.4 - 16 MHz

Crystal Oscillator

External

Clock Input

CPU

clkCPU NVM MEMORY

FLASH

EEPROM

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

9.3 Clock Options

9.3.1 32 kHz Ultra Low Power Internal Oscillator

9.3.2

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.

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.

18

8134I–AVR–12/10

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