Datasheet

428
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
If a pending interrupt cannot wake the part up from the selected mode, the current consumption will
increase during sleep when executing the SLEEP instruction directly after a SEI instruction.
Problem Fix/work around
Before entering sleep, interrupts not used to wake up the part from the sleep mode should be disabled.
3. Increased power consumption in power-down mode
The typical power consumption is increased by about 30 µA in power-down mode.
Problem Fix/work around
None.
4. Internal RC oscillator start up may fail
When the part is configured to start on internal RC oscillator, the oscillator may not start properly after
power-on.
Problem Fix/work around
Do not configure the part to start on internal RC oscillator.
5. Internal RC oscillator calibration
8 MHz frequency can be impossible to reach with internal RC even when using maximal OSCAL value.
Problem Fix/work around
None.
6. Incorrect execution of VBUSTI interrupt
The CPU may incorrectly execute the interrupt vector related to the VBUSTI interrupt flag.
Problem fix/work around
Do not enable this interrupt. Firmware must process this USB event by polling VBUSTI.
7. Timer 4 11-bits enhanced PWM mode
Timer 4 11-bits enhanced mode is not functional.
Problem Fix/work around
None.