AT90SCR100 datasheet(46/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

• 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, operation will continue as before the shutdown.

• Bit 4 - Res: Reserved bit

Reserved for future use 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 - 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 reinitialized to ensure proper

operation.

• Bit 0 - Res: Reserved bit

Reserved for future use and will always read as zero.

8.2.3

PRR1 – Power Reduction Register 1

The Power Reduction Register allows the shut down of peripherals directly connected to CPU

resources. These peripherals are activated by default and can be shut down for power con-

sumption reasons if they are not used by an application.

• Bit 7 - Res: Reserved bit

Reserved for future use and will always read as zero.

• Bit 6 - Res: Reserved bit

Reserved for future use and will always read as zero.

• Bit 5 - PRKB: Power Reduction Keyboard

Bit

76543

$000065

PRKB

PRAES

PRSCI

PRHSSPI

PRUSB

PRUSBH

PRR1

Read/write

R/W

Initial value

00000

0x00

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