ATMEGA640 datasheet(55/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

11.10.2

PRR0 – Power Reduction Register 0

• Bit 7 - PRTWI: Power Reduction TWI

Writing a logic one to this bit shuts down the TWI by stopping the clock to the module. When waking up the TWI

again, the TWI should be re initialized to ensure proper operation.

• Bit 6 - PRTIM2: Power Reduction Timer/Counter2

Writing a logic one to this bit shuts down the Timer/Counter2 module in synchronous mode (AS2 is 0). When the

Timer/Counter2 is enabled, operation will continue like before the shutdown.

• Bit 5 - PRTIM0: Power Reduction Timer/Counter0

Writing a logic one to this bit shuts down the Timer/Counter0 module. When the Timer/Counter0 is enabled, opera-

tion will continue like before the shutdown.

• Bit 4 - Res: Reserved bit

This bit is reserved bit and will always read as zero.

• Bit 3 - PRTIM1: Power Reduction Timer/Counter1

Writing a logic one to this bit shuts down the Timer/Counter1 module. When the Timer/Counter1 is enabled, opera-

tion will continue like before the shutdown.

• Bit 2 - PRSPI: Power Reduction Serial Peripheral Interface

Writing a 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 - PRUSART0: Power Reduction USART0

Writing a logic one to this bit shuts down the USART0 by stopping the clock to the module. When waking up the

USART0 again, the USART0 should be re initialized to ensure proper operation.

• Bit 0 - PRADC: Power Reduction ADC

Writing a logic one to this bit shuts down the ADC. The ADC must be disabled before shut down. The analog com-

parator cannot use the ADC input MUX when the ADC is shut down.

Bit

543

(0x64)

PRTWI

PRTIM2

PRTIM0

–

PRTIM1

PRSPI

PRUSART0

PRADC

PRR0

Read/Write

R/W

Initial Value

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