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2549O–AVR–05/12

ATmega640/1280/1281/2560/2561

13.3.5 Alternate Functions of Port E

The Port E pins with alternate functions are shown in Table 13-15.

Note: 1. Only for ATmega1281/2561. For ATmega640/1280/2560 these functions are placed on

MISO/MOSI pins.

• INT7/ICP3/CLKO – Port E, Bit 7

INT7, External Interrupt source 7: The PE7 pin can serve as an external interrupt source.

ICP3, Input Capture Pin 3: The PE7 pin can act as an input capture pin for Timer/Counter3.

CLKO - Divided System Clock: The divided system clock can be output on the PE7 pin. The

divided system clock will be output if the CKOUT Fuse is programmed, regardless of the

PORTE7 and DDE7 settings. It will also be output during reset.

• INT6/T3 – Port E, Bit 6

INT6, External Interrupt source 6: The PE6 pin can serve as an external interrupt source.

T3, Timer/Counter3 counter source.

• INT5/OC3C – Port E, Bit 5

INT5, External Interrupt source 5: The PE5 pin can serve as an External Interrupt source.

OC3C, Output Compare Match C output: The PE5 pin can serve as an External output for the

Timer/Counter3 Output Compare C. The pin has to be configured as an output (DDE5 set “one”)

to serve this function. The OC3C pin is also the output pin for the PWM mode timer function.

Table 13-15. Port E Pins Alternate Functions

Port Pin Alternate Function

PE7

INT7/ICP3/CLK0

(External Interrupt 7 Input, Timer/Counter3 Input Capture Trigger or Divided System Clock)

PE6

INT6/ T3

(External Interrupt 6 Input or Timer/Counter3 Clock Input)

PE5

INT5/OC3C

(External Interrupt 5 Input or Output Compare and PWM Output C for Timer/Counter3)

PE4

INT4/OC3B

(External Interrupt4 Input or Output Compare and PWM Output B for Timer/Counter3)

PE3

AIN1/OC3A

(Analog Comparator Negative Input or Output Compare and PWM Output A for

Timer/Counter3)

PE2

AIN0/XCK0

(Analog Comparator Positive Input or USART0 external clock input/output)

PE1

PDO

(1)

/TXD0

(Programming Data Output or USART0 Transmit Pin)

PE0

PDI

(1)

/RXD0/PCINT8

(Programming Data Input, USART0 Receive Pin or Pin Change Interrupt 8)