ATmega16U4 datasheet(74/408 Pages) ATMEL

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7766D–AVR–01/09

ATmega16U4/ATmega32U4

10.3.3

Alternate Functions of Port C

The Port C alternate function is as follows:

• 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.

Table 10-5.

Overriding Signals for Alternate Functions in PB3.PB0

Signal

Name

PB3/PD0/PCINT3/

MISO

PB2/PDI/PCINT2/

MOSI

PB1/PCINT1/

SCK

PB0/PCINT0/

PUOE

SPE • MSTR

PUOV

PORTB3 • PUD

PORTB2 • PUD

PORTB1 • PUD

PORTB0 • PUD

DDOE

SPE • MSTR

DDOV

PVOE

SPE • MSTR

PVOV

SPI SLAVE OUTPUT

SPI MSTR OUTPUT

SCK OUTPUT

DIEOE

PCINT3 • PCIE0

PCINT2 • PCIE0

PCINT1 •

PCIE0

PCINT0 •

PCIE0

DIEOV

SPI MSTR INPUT

PCINT3 INPUT

SPI SLAVE INPUT

PCINT2 INPUT

SCK INPUT

PCINT1 INPUT

SPI SS

PCINT0 INPUT

AIO

–

Table 10-6.

Port C Pins Alternate Functions

Port Pin

Alternate Function

PC7

ICP3/CLKO/OC4A(Input Capture Timer 3 or CLK0 (Divided

System Clock) or Output Compare and direct PWM output A

for Timer 4)

PC6

OC.3A/OC4A (Output Compare and PWM output A for

Timer/Counter3 or Output Compare and complementary

PWM output A for Timer 4)

PC5

Not present on pin-out.

PC4

PC3

PC2

PC1

PC0

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