ATmega16U4 datasheet(76/408 Pages) ATMEL

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7766D–AVR–01/09

ATmega16U4/ATmega32U4

10.3.4

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 10-8.

The alternate pin configuration is as follows:

• T0/OC.4D/ADC10 – Port D, Bit 7

T0, Timer/Counter0 counter source.

OC.4D: Timer 4 Output Compare D. 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 (DDD7 set “one”) to serve this

function.

ADC10: Analog to Digital Converter, Channel 10.

• T1/OC.4D/ADC9 – Port D, Bit 6

T1, Timer/Counter1 counter source.

OC.4D: Timer 4 Output Compare D. This pin can be used to generate a high-speed PWM signal

from Timer 4 module, complementary to OC.4D (PD7) signal. The pin has to be configured as

an output (DDD6 set “one”) to serve this function.

ADC9: Analog to Digital Converter, Channel 9.

• XCK1/CTS – Port D, Bit 5

XCK1, USART1 External clock. The Data Direction Register (DDD5) controls whether the clock

is output (DDD5 set) or input (DDD5 cleared). The XCK1 pin is active only when the USART1

operates in Synchronous mode.

CTS: Clear-To-Send flow control signal used by enhanced UART module.

• ICP1/ADC8 – Port D, Bit 4

ICP1 – Input Capture Pin 1: The PD4 pin can act as an input capture pin for Timer/Counter1.

ADC8: Analog to Digital Converter, Channel 8.

Table 10-8.

Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

T0/OC.4D/ADC10 (Timer/Counter0 Clock Input or Timer 4 Output Compare D /

PWM output or Analog to Digital Converter channel 10)

PD6

T1/OC.4D/ADC9 (Timer/Counter1 Clock Input or Timer 4 Output

Complementary Compare D / PWM output or Analog to Digital Converter

channel 9)

PD5

XCK1/CTS (USART1 External Clock Input/Output or UART flow control CTS

signal)

PD4

ICP1/ADC8 (Timer/Counter1 Input Capture Trigger or Analog to Digital

Converter channel 8)

PD3

INT3/TXD1 (External Interrupt3 Input or USART1 Transmit Pin)

PD2

INT2/RXD1 (External Interrupt2 Input or USART1 Receive Pin)

PD1

INT1/SDA (External Interrupt1 Input or TWI Serial DAta)

PD0

INT0/SCL/OC0B (External Interrupt0 Input or TWI Serial CLock or Output

Compare for Timer/Counter0)

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