ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 80

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

10.3.5
10.3.6
7766F–AVR–11/10
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/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.
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/AIN0
0
0
0
0
0
0
INT6 ENABLE
1
INT6 INPUT
AIN0 INPUT
Alternate Function
Not present on pin-out.
INT6/AIN0 (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.
ATmega16/32U4
Table
10-13. If
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