attiny261a-xu ATMEL Corporation, attiny261a-xu Datasheet - Page 38

• Manufacturer Part Number: attiny261a-xu
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

7.5.2
38
ATtiny261A/461A/861A
PRR – Power Reduction Register
These bits select between the three available sleep modes as shown in
Table 7-2.
• Bit 2 – BODSE: BOD Sleep Enable
The BODSE bit enables setting of BODS control bit, as explained on BODS bit description. BOD
disable is controlled by a timed sequence.
The Power Reduction Register provides a method to reduce power consumption by allowing
peripheral clock signals to be disabled.
• Bits 7, 6, 5, 4 – Res: Reserved Bits
These bits are reserved and will always read 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 – 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 1 – PRUSI: Power Reduction USI
Writing a logic one to this bit shuts down the USI by stopping the clock to the module. When
waking up the USI again, the USI should be re initialized to ensure proper operation.
• Bit 0 – PRADC: Power Reduction ADC
Writing a logic one to this bit shuts down the ADC. The ADC must be disabled before shut down.
Also analog comparator needs this clock.
Bit
0x36 (0x56)
Read/Write
Initial Value
SM1
0
0
1
1
Sleep Mode Select
7
–
R
0
6
-
R
0
SM0
0
1
0
1
5
-
R
0
Sleep Mode
Idle
ADC Noise Reduction
Power-down
Standby
4
-
R
0
3
PRTIM1
R/W
0
2
PRTIM0
R/W
0
1
PRUSI
R/W
0
Table
7-2.
0
PRADC
R/W
0
8197B–AVR–01/10
PRR