ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 39

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

10. Power Management and Sleep Modes
10.1
10.2
Table 10-1.
10.3
8285D–AVR–06/11
Sleep Mode
Idle
ADC NRM
Power-down
Power-save
Standby
Overview
Sleep Modes
BOD Disable
(1)
Active Clock Domains and Wake-up Sources in the Different Sleep Modes.
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Active Clock Domains
(1)
Sleep modes enable the application to shut down unused modules in the MCU, thereby saving-
power. The AVR provides various sleep modes allowing the user to tailor the power
consumption to the application’s requirements.
Figure 9-1 on page 29
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P, and their distribu-
tion. The figure is helpful in selecting an appropriate sleep mode.
sleep modes and their wake up sources and BOD disable ability
Note:
Notes:
To enter any of the sleep modes, the SE bit in SMCR must be written to logic one and a SLEEP
instruction must be executed. The SM2, SM1, and SM0 bits in the SMCR Register select which
sleep mode will be activated by the SLEEP instruction. See
summary.
If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU wakes up. The MCU
is then halted for four cycles in addition to the start-up time, executes the interrupt routine, and
resumes execution from the instruction following SLEEP. The contents of the Register File and
SRAM are unaltered when the device wakes up from sleep. If a reset occurs during sleep mode,
the MCU wakes up and executes from the Reset Vector.
When the Brown-out Detector (BOD) is enabled by BODLEVEL fuses - see
322
period. To save power, it is possible to disable the BOD by software for some of the sleep-
modes, see
same level as when BOD is globally disabled by fuses. If BOD is disabled in software, the BOD
and onwards, the BOD is actively monitoring the power supply voltage during a sleep
X
1. BOD disable is only available for ATmega165PA/325PA/3250PA/645P/6450P
1. Only recommended with external crystal or resonator selected as clock source.
2. If Timer/Counter2 is running in asynchronous mode.
3. For INT0, only level interrupt.
Table 10-1 on page
X
X
X
X
X
presents the different clock systems in the
Oscillators
X
X
X
39. The sleep mode power consumption will then be at the
X
X
X
(2)
(2)
X
X
X
X
X
(3)
(3)
(3)
(3)
X
X
X
X
X
Wake-up Sources
X
X
X
(2)
(1)
Table 10-2 on page 44
Table 10-1
.
X
X
X
X
Table 28-7 on page
shows the different
X
X
X
X
for a
39