ATmega32U2 datasheet(46/314 Pages) ATMEL

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7799B–AVR–07/09

ATmega8U2/16U2/32U2

9.10.2

PRR0 – Power Reduction Register 0

• Bit 7:6 - Res: Reserved bits

These bits are reserved and will always read as zero.

• 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, operation will continue like before the shutdown.

• Bit 4 - Res: Reserved bit

This bit is reserved 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, operation 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 - Res: Reserved bit

These bits are reserved and will always read as zero.

• Bit 0 - Res: Reserved bit

These bits are reserved and will always read as zero.

9.10.3

PRR1 – Power Reduction Register 1

• Bit 7 - PRUSB: Power Reduction USB

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

waking up the USB again, the USB should be re initialized to ensure proper operation.

• Bit 6:1 - Res: Reserved bits

These bits are reserved and will always read as zero.

• 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

(0x64)

PRTIM0

–

PRTIM1

PRSPI

PRR0

Read/Write

R/W

Initial Value

Bit

654

(0x65)

PRUSB

–

PRUSART1

PRR1

Read/Write

R/W

Initial Value

ATmega32U2 Datasheet(PDF) 46 Page - ATMEL Corporation

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