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ATMEGA649 Datasheet(PDF) 39 Page - ATMEL Corporation |
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ATMEGA649 Datasheet(HTML) 39 Page - ATMEL Corporation |
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39 / 375 page  39 ATmega329/3290/649/6490 2552H–AVR–11/06 Writing logic one to this bit shuts down the Serial Peripheral Interface by stopping the clock to the module. When waking up the SPI again, the SPI should be re-initialized to ensure proper operation. • Bit 1 - PRUSART: Power Reduction USART Writing logic one to this bit shuts down the USART by stopping the clock to the module. When waking up the USART again, the USART should be re-initialized to ensure proper operation. • Bit 0 - PRADC: Power Reduction ADC Writing logic one to this bit shuts down the ADC. The ADC must be disabled before shut down. The analog comparator cannot use the ADC input MUX when the ADC is shut down. Note: The Analog Comparator is disabled using the ACD-bit in the “ACSR – Analog Compara- tor Control and Status Register” on page 200. |
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