參數(shù)資料
型號(hào)： IQ80C52EXXX-12D
廠(chǎng)商： ATMEL CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁(yè)數(shù)： 19/108頁(yè)
文件大?。?/td> 3682K
代理商： IQ80C52EXXX-12D
18
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
10. System Clock and Clock options
10.1
Features
Fast start-up time
Safe run-time clock switching
Internal Oscillators:
– 32 MHz run-time calibrated RC oscillator
– 2 MHz run-time calibrated RC oscillator
– 32.768 kHz calibrated RC oscillator
– 32 kHz Ultra Low Power (ULP) oscillator with 1 kHz ouput
External clock options
– 0.4 - 16 MHz Crystal Oscillator
– 32 kHz Crystal Oscillator
– External clock
PLL with internal and external clock options with 1 to 31x multiplication
Clock Prescalers with 1 to 2048x division
Fast peripheral clock running at 2 and 4 times the CPU clock speed
Automatic Run-Time Calibration of internal oscillators
Crystal Oscillator failure detection
10.2
Overview
XMEGA A4 has an advanced clock system, supporting a large number of clock sources. It incor-
porates both integrated oscillators, external crystal oscillators and resonators. A high frequency
Phase Locked Loop (PLL) and clock prescalers can be controlled from software to generate a
wide range of clock frequencies from the clock source input.
It is possible to switch between clock sources from software during run-time. After reset the
device will always start up running from the 2 Mhz internal oscillator.
A calibration feature is available, and can be used for automatic run-time calibration of the inter-
nal 2 MHz and 32 MHz oscillators. This reduce frequency drift over voltage and temperature.
A Crystal Oscillator Failure Monitor can be enabled to issue a Non-Maskable Interrupt and
switch to internal oscillator if the external oscillator fails. Figure 10-1 on page 19 shows the prin-
cipal clock system in XMEGA A4.
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