ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 39

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

10. Power Management and Sleep Modes
10.1
Table 10-1.
9223B–AVR–09/11
Sleep Mode
Idle
ADC Noise
Reduction
Power-down
Power-save
Standby
Extended
Standby
Notes:
(1)
Sleep Modes
1. Only recommended with external crystal or resonator selected as clock source.
2. If Timer/Counter2 is running in asynchronous mode.
3. For INT1 and INT0, only level interrupt.
Active Clock Domains and Wake-up Sources in the Different Sleep Modes.
Active Clock Domains
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 consump-
tion to the application’s requirements.
When enabled, the Brown-out Detector (BOD) actively monitors the power supply voltage dur-
ing the sleep periods. To further save power, it is possible to disable the BOD in some sleep
modes. See
F i g u r e 9 - 1 o n p a g e 2 6
ATmega48PA/88PA/168PA, and their distribution. The figure is helpful in selecting an appro-
priate sleep mode.
disable ability
Note:
To enter any of the six 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 (Idle, ADC Noise Reduction, Power-down, Power-save, Standby, or
Extended Standby) will be activated by the SLEEP instruction. See
a 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.
X
Atmel ATmega48PA/88PA/168PA [Preliminary]
1. BOD disable is only available for ATmega48PA/88PA/168PA.
X
X
“BOD Disable
(1)
X
.
X
X
X
(2)
Table 10-1
Oscillators
X
X
X
X
()
” on page 40
p r e s e n t s t h e d i f f e r e n t c l o c k s y s t e m s i n t h e A t m e l
X
X
X
X
shows the different sleep modes, their wake up sources BOD
(2)
(2)
(2)
(2)
X
X
X
X
X
for more details.
X
(3)
(3)
(3)
(3)
(3)
X
X
X
X
X
X
Wake-up Sources
X
X
X
X
(2)
X
X
Table 10-2 on page 44
X
X
X
X
X
X
X
X
X
X
X
X
X
for
39
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