ATMEGA640 datasheet(56/436 Pages) MICROCHIP

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

DS40002211A

11.10.3

PRR1 – Power Reduction Register 1

• Bit 7:6 - Res: Reserved bits

These bits are reserved and will always read as zero.

• Bit 5 - PRTIM5: Power Reduction Timer/Counter5

Writing a logic one to this bit shuts down the Timer/Counter5 module. When the Timer/Counter5 is enabled, opera-

tion will continue like before the shutdown.

• Bit 4 - PRTIM4: Power Reduction Timer/Counter4

Writing a logic one to this bit shuts down the Timer/Counter4 module. When the Timer/Counter4 is enabled, opera-

tion will continue like before the shutdown.

• Bit 3 - PRTIM3: Power Reduction Timer/Counter3

Writing a logic one to this bit shuts down the Timer/Counter3 module. When the Timer/Counter3 is enabled, opera-

tion will continue like before the shutdown.

• Bit 2 - PRUSART3: Power Reduction USART3

Writing a logic one to this bit shuts down the USART3 by stopping the clock to the module. When waking up the

USART3 again, the USART3 should be re initialized to ensure proper operation.

• Bit 1 - PRUSART2: Power Reduction USART2

Writing a logic one to this bit shuts down the USART2 by stopping the clock to the module. When waking up the

USART2 again, the USART2 should be re initialized to ensure proper operation.

• Bit 0 - PRUSART1: Power Reduction USART1

Writing a logic one to this bit shuts down the USART1 by stopping the clock to the module. When waking up the

USART1 again, the USART1 should be re initialized to ensure proper operation.

Bit

543

(0x65)

–

PRTIM5

PRTIM4

PRTIM3

PRUSART3

PRUSART2

PRUSART1

PRR1

Read/Write

R/W

Initial Value

ATMEGA640 Datasheet(PDF) 56 Page - Microchip Technology