Datasheet

7766FS–AVR–11/10

ATmega16/32U4

3. Timer 4 11-bits enhanced PWM mode

Timer 4 11-bits enhanced mode is not functional.

Problem Fix/work around

None.

8.3 ATmega16U4/ATmega32U4 Rev C

Not sampled

8.4 ATmega16U4/ATmega32U4 Rev B

• Spike on TWI pins when TWI is enabled

• High current consumption in sleep mode

• Incorrect execution of VBUSTI interrupt

• Timer 4 11-bits enhanced PWM mode

1. Spike on TWI pins when TWI is enabled

100 ns negative spike occurs on SDA and SCL pins when TWI is enabled.

Problem Fix/work around

Enable ATmega16U4/ATmega32U4 TWI before the other nodes of the TWI network.

2. High current consumption in sleep mode

If a pending interrupt cannot wake the part up from the selected mode, the current consump-

tion 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. 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.

Timer 4 11-bits enhanced PWM mode

Timer 4 11-bits enhanced mode is not functional.

Problem Fix/work around

None.