ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 75
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ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 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)
2.1
Eeprom (bytes)
512
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
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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
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