ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 55

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

PRR0 – Power Reduction
Register 0
2549K–AVR–01/07
• 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 like before the shutdown.
• Bit 4 - Res: Reserved bit
This bit is reserved bit 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 mod-
ule. When waking up the USART0 again, the USART0 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. The analog comparator cannot use the ADC input MUX when the ADC is
shut down.
Bit
(0x64)
Read/Write
Initial Value
PRTWI
R/W
7
0
PRTIM2
R/W
6
0
ATmega640/1280/1281/2560/2561
PRTIM0
R/W
5
0
R
4
–
0
PRTIM1
R/W
3
0
PRSPI
R/W
2
0
PRUSART0
R/W
1
0
PRADC
R/W
0
0
PRR0
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