參數(shù)資料
型號: MPG5374X
元件分類: LED
英文描述: T-1 3/4 SINGLE COLOR LED, GREEN, 5 mm
封裝: ROHS COMPLIANT PACKAGE-2
文件頁數(shù): 10/32頁
文件大?。?/td> 413K
代理商: MPG5374X
18
XMEGA C3 [DATASHEET]
8361D–AVR–07/2013
10.
System Clock and Clock options
10.1 Features
Fast start-up time
Safe run-time clock switching
Internal oscillators:
– 32MHz run-time calibrated and tuneable oscillator
– 2MHz run-time calibrated oscillator
– 32.768kHz calibrated oscillator
– 32kHz ultra low power (ULP) oscillator with 1kHz output
External clock options
– 0.4MHz - 16MHz crystal oscillator
– 32.768kHz crystal oscillator
– External clock
PLL with 20MHz - 128MHz output frequency
– Internal and external clock options and 1x to 31x multiplication
– Lock detector
Clock prescalers with 1x to 2048x division
Fast peripheral clocks running at two and four times the CPU clock
Automatic run-time calibration of internal oscillators
External oscillator and PLL lock failure detection with optional non-maskable interrupt
10.2 Overview
Atmel AVR XMEGA C3 devices have a flexible clock system supporting a large number of clock sources. It incorporates
both accurate internal oscillators and external crystal oscillator and resonator support. A high-frequency phase locked
loop (PLL) and clock prescalers can be used to generate a wide range of clock frequencies. A calibration feature (DFLL)
is available, and can be used for automatic run-time calibration of the internal oscillators to remove frequency drift over
voltage and temperature. An oscillator failure monitor can be enabled to issue a non-maskable interrupt and switch to the
internal oscillator if the external oscillator or PLL fails.
When a reset occurs, all clock sources except the 32kHz ultra low power oscillator are disabled. After reset, the device
will always start up running from the 2MHz internal oscillator. During normal operation, the system clock source and
prescalers can be changed from software at any time.
Figure 10-1 on page 19 presents the principal clock system. Not all of the clocks need to be active at a given time. The
clocks for the CPU and peripherals can be stopped using sleep modes and power reduction registers, as described in
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