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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