DOC7707 datasheet(79/307 Pages) ETC1

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7707F–AVR–11/10

AT90USB82/162

11.3.4

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 11-9.

The alternate pin configuration is as follows:

• HWB/TO/INT7/CTS, Bit 7

HWB, Hardware Boot : The PD7 pin can serve as

TO, Timer/Counter0 counter source.

INT7, External Interrupt source 7: The PD7 pin can serve as an external interrupt source to the

MCU.

CTS, USART1 Transmitter Flow Control. This pin can control the transmitter in function of its

state.

• INT6/RTS,Bit 6

INT6, External Interrupt source 6: The PD6 pin can serve as an external interrupt source to the

MCU.

RTS, USART1 Receiver Flow Control. This pin can control the receiver in function of its state.

• XCK1/PCINT12, Bit 5

XCK1, USART1 External Clock : The data direction register DDRD5 controls whether the clock

is output (DDRD5 set) or input (DDRD5 cleared). The XCK1 pin is active only when the USART1

operates in Synchronous Mode.

PCINT12, Pin Change Interrupt source 12: The PD5 pin can serve as an external interrupt

source.

• INT5, Bit 4

INT5, External Interrupt source 5: The PD4 pin can serve as an external interrupt source to the

MCU.

• INT3/TXD1, Bit 3

INT3, External Interrupt source 3: The PD3 pin can serve as an external interrupt source to the

MCU.

Table 11-9.

Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

HWB/TO/INT7/CTS

PD6

INT6/RTS

PD5

XCK1/PCINT12 (USART1 External Clock Input/Output)

PD4

INT5

PD3

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

PD2

INT2/AIN1/RXD1(External Interrupt2 Input or USART1 Receive Pin)

PD1

INT1/AIN0 (External Interrupt1 Input)

PD0

INT0/OC0B (External Interrupt0 Input)

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