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Time to Sleep
=============
USB suspend no activity on USB line for 3ms
No Interaction no user interaction
matrix has no change
matrix has no switch on
AVR Power Management
====================
V-USB suspend
USB suspend
http://vusb.wikidot.com/examples
MCUSR MCU Status Register
WDRF Watchdog Reset Flag
BORF
EXTRF
PORF Power-on Reset Flag
SMCR Sleep Mode Control Register
SE Sleep Enable
SM2:0
#define set_sleep_mode(mode) \
#define SLEEP_MODE_IDLE (0)
#define SLEEP_MODE_ADC _BV(SM0)
#define SLEEP_MODE_PWR_DOWN _BV(SM1)
#define SLEEP_MODE_PWR_SAVE (_BV(SM0) | _BV(SM1))
#define SLEEP_MODE_STANDBY (_BV(SM1) | _BV(SM2))
#define SLEEP_MODE_EXT_STANDBY (_BV(SM0) | _BV(SM1) | _BV(SM2))
ACSR Analog Comparator Control and Status Register
To disable Analog Comparator
ACSR = 0x80;
or
ACSR &= ~_BV(ACIE);
ACSR |= _BV(ACD);
ACD: Analog Comparator Disable
When this bit is written logic one, the power to the Analog Comparator is
switched off. This bit can be set at any time to turn off the Analog
Comparator. This will reduce power consumption in Active and Idle mode.
When changing the ACD bit, the Analog Comparator Interrupt must be disabled
by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when
the bit is changed.
DIDR1 Digital Input Disable Register 1
AIN1D
AIN0D
When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be written logic one to reduce power consumption in the digital input buffer.
PRR Power Reduction Register
PRTWI
PRTIM2
PRTIM0
PRTIM1
PRSPI
PRUSART0
PRADC