ATXMEGA32D4-CU 查看數據表（PDF） - Atmel Corporation

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ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

Figure 9-1. The clock system, clock sources and clock distribution.

Real Time

Counter

Peripherals

RAM

AVR CPU

Non-Volatile

Memory

clkPER

clkPER2

clkPER4

clkCPU

Brown-out

Detector

Watchdog

Timer

clkRTC

RTCSRC

System Clock Prescalers

clkSYS

System Clock Multiplexer

(SCLKSEL)

PLL

PLLSRC

XOSCSEL

32 kHz

Int. ULP

32.768 kHz

Int. OSC

32.768 kHz

TOSC

0.4 – 16 MHz

XTAL

32 MHz

Int. Osc

2 MHz

Int. Osc

9.3 Clock Sources

The clock sources are divided in two main groups: internal oscillators and external clock

sources. Most of the clock sources can be directly enabled and disabled from software, while

others are automatically enabled or disabled, depending on peripheral settings. After reset, the

device starts up running from the 2MHz internal oscillator. The other clock sources, DFLLs and

PLL, are turned off by default.

The internal oscillators do not require any external components to run. For details on character-

istics and accuracy of the internal oscillators, refer to the device datasheet.

21

8135L–AVR–06/12

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