8-bit AVR Microcontrollers

Power Reduction Register 1

Name:
PRR1
Offset:
0x65
Reset:
0x00
Access:
-
Bit76543210
PRTWI1PRPTCPRTIM4PRSPI1PRTIM3
AccessR/WR/WR/WR/WR/W
Reset00000

Bit 5 – PRTWI1: Power Reduction TWI1

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

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

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

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

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.