ATmega16U4 datasheet(79/408 Pages) ATMEL

79 / 408 page

7766D–AVR–01/09

ATmega16U4/ATmega32U4

10.3.5

Alternate Functions of Port E

The Port E pins with alternate functions are shown in Table 10-11.

• INT6/AIN0 – Port E, Bit 6

INT6, External Interrupt source 6: The PE6 pin can serve as an external interrupt source.

AIN0 – Analog Comparator Negative input. This pin is directly connected to the negative input of

the Analog Comparator.

•HWB – Port E, Bit 2

HWB allows to execute the bootloader section after reset when tied to ground during external

reset pulse. The HWB mode of this pin is active only when the HWBE fuse is enable. During nor-

mal operation (excluded Reset), this pin acts as a general purpose I/O.

10.3.6

Alternate Functions of Port F

The Port F has an alternate function as analog input for the ADC as shown in Table 10-13. If

some Port F pins are configured as outputs, it is essential that these do not switch when a con-

version is in progress. This might corrupt the result of the conversion. If the JTAG interface is

Table 10-11. Port E Pins Alternate Functions

Port Pin

Alternate Function

PE7

Not present on pin-out.

PE6

INT6/AIN0 (External Interrupt 6 Input or Analog Comparator Positive Input)

PE5

Not present on pin-out.

PE4

PE3

PE2

HWB (Hardware bootloader activation)

PE1

Not present on pin-out.

PE0

Table 10-12. Overriding Signals for Alternate Functions PE6, PE2

Signal

Name

PE6/INT6/AIN0

PE2/HWB

PUOE

PUOV

DDOE

DDOV

PVOE

PVOV

DIEOE

INT6 ENABLE

DIEOV

INT6 INPUT

HWB

AIO

AIN0 INPUT

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