Rainbow Electronics ATmega3290P_V - Manual (Page 39)

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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.