atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 78

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

10.3.5
10.3.6
78
ATmega32U4
Alternate Functions of Port E
Alternate Functions of Port F
The Port E pins with alternate functions are shown in
Table 10-11. Port E Pins Alternate Functions
• INT6/AIN.0 – 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.
Table 10-12. Overriding Signals for Alternate Functions PE6, PE2
The Port F has an alternate function as analog input for the ADC as shown in
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
Port Pin
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
PE6/INT6/AIN.0
0
0
0
0
0
0
INT6 ENABLE
1
INT6 INPUT
AIN0 INPUT
Alternate Function
Not present on pin-out.
INT6/AIN.0 (External Interrupt 6 Input or Analog Comparator Positive Input)
Not present on pin-out.
HWB (Hardware bootloader activation)
Not present on pin-out.
PE2/HWB
0
0
0
1
0
0
0
0
HWB
-
Table
10-11.
Table
7766A–AVR–03/08
10-13. If