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ATXMEGA128A1-AU Scheda tecnica(PDF) 19 Page - ATMEL Corporation |
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ATXMEGA128A1-AU Scheda tecnica(HTML) 19 Page - ATMEL Corporation |
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19 / 99 page  19 8067I–AVR–04/09 XMEGA A1 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 A1 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 20 shows the prin- cipal clock system in XMEGA A1. |
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