Datasheet

13.12.4 Power Reduction Register 1

Name: PRR1

Offset: 0x65

Reset: 0x00

Property: -

Bit 7 6 5 4 3 2 1 0

PRTWI1 PRPTC PRTIM4 PRSPI1 PRTIM3

Access

R/W R/W R/W R/W R/W

Reset 0 0 0 0 0

Bit 5 – PRTWI1 Power Reduction TWI1

Writing a logic one to this bit shuts down the TWI1 by stopping the clock to the module. When waking up

the TWI1 again, the TWI1 should be re initialized to ensure proper operation.

Bit 4 – PRPTC Power Reduction PTC

Writing a logic one to this bit shuts down the PTC module. When the PTC is enabled, operation will

continue like before the shutdown.

Bit 3 – PRTIM4 Power Reduction Timer/Counter4

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

enabled, operation will continue like before the shutdown.

Bit 2 – PRSPI1 Power Reduction Serial Peripheral Interface 1

If using debugWIRE On-chip Debug System, this bit should not be written to one. Writing a logic one to

this bit shuts down the Serial Peripheral Interface1 by stopping the clock to the module. When waking up

the SPI1 again, the SPI1 should be re initialized to ensure proper operation.

Bit 0 – PRTIM3 Power Reduction Timer/Counter3

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

enabled, operation will continue like before the shutdown.

ATmega328PB

Power Management and Sleep Modes

Datasheet Complete

DS40001906C-page 73