ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 75

• 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

10.3.3
7766F–AVR–11/10
Alternate Functions of Port C
Table 10-5.
The Port C alternate function is as follows:
Table 10-6.
• ICP3/CLKO/OC.4A – Port C, Bit 7
ICP3: If Timer 3 is correctly configured, this pin can serve as Input Capture feature.
CLKO: When the corresponding fuse is enabled, this pin outputs the internal microcontroller
working frequency. If the clock prescaler is used, this will affect this output frequency.
OC.4A: Timer 4 Output Compare A. This pin can be used to generate a high-speed PWM signal
from Timer 4 module. The pin has to be configured as an output (DDC7 set “one”) to serve this
function.
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PB3/PD0/PCINT3/
MISO
SPE • MSTR
PORTB3 • PUD
SPE • MSTR
0
SPE • MSTR
SPI SLAVE OUTPUT
PCINT3 • PCIE0
1
SPI MSTR INPUT
PCINT3 INPUT
–
Port Pin
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
Overriding Signals for Alternate Functions in PB3.PB0
Port C Pins Alternate Functions
Alternate Function
ICP3/CLKO/OC4A(Input Capture Timer 3 or CLK0 (Divided
System Clock) or Output Compare and direct PWM output A
for Timer 4)
OC.3A/OC4A (Output Compare and PWM output A for
Timer/Counter3 or Output Compare and complementary
PWM output A for Timer 4)
Not present on pin-out.
PB2/PDI/PCINT2/
MOSI
SPE • MSTR
PORTB2 • PUD
SPE • MSTR
0
SPE • MSTR
SPI MSTR OUTPUT
PCINT2 • PCIE0
1
SPI SLAVE INPUT
PCINT2 INPUT
–
PB1/PCINT1/
SCK
SPE • MSTR
PORTB1 • PUD
SPE • MSTR
0
SPE • MSTR
SCK OUTPUT
PCINT1 •
PCIE0
1
SCK INPUT
PCINT1 INPUT
–
ATmega16/32U4
PB0/PCINT0/
SS
SPE • MSTR
PORTB0 • PUD
SPE • MSTR
0
0
0
PCINT0 •
PCIE0
1
SPI SS
PCINT0 INPUT
–
75