參數(shù)資料
型號(hào): MR80C52CXXX-16
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
文件頁數(shù): 45/134頁
文件大?。?/td> 3805K
代理商: MR80C52CXXX-16
18
8068U–AVR–06/2013
XMEGA A3
Not recommended for new designs -
Use XMEGA A3U 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
External clock options
– 0.4 - 16 MHz Crystal Oscillator
– 32.768 kHz Crystal Oscillator
– External clock
PLL with internal and external clock options with 2 to 31x multiplication
Clock Prescalers with 2 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 A3 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 A3.
相關(guān)PDF資料
PDF描述
MR80C52CXXX-25:R 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
MQ80C154-36/883D 8-BIT, 36 MHz, MICROCONTROLLER, CQFP44
MC80C52XXX-20SHXXX 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
MQ80C52CXXX-36SHXXX:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
MR80C52TXXX-20/883:D 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
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