ATMEGA649 datasheet(75/375 Pages) ATMEL

75 / 375 page

ATmega329/3210/649/6410

2552H–AVR–11/06

Alternate Functions of Port E

The Port E pins with alternate functions are shown in Table 39.

• PCINT7 – Port E, Bit 7

PCINT7, Pin Change Interrupt Source 7: The PE7 pin can serve as an external interrupt

source.

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.

• DO/PCINT6 – Port E, Bit 6

DO, Universal Serial Interface Data output.

PCINT6, Pin Change Interrupt Source 6: The PE6 pin can serve as an external interrupt

source.

• DI/SDA/PCINT5 – Port E, Bit 5

DI, Universal Serial Interface Data input.

SDA, Two-wire Serial Interface Data:

PCINT5, Pin Change Interrupt Source 5: The PE5 pin can serve as an external interrupt

source.

• USCK/SCL/PCINT4 – Port E, Bit 4

USCK, Universal Serial Interface Clock.

SCL, Two-wire Serial Interface Clock.

PCINT4, Pin Change Interrupt Source 4: The PE4 pin can serve as an external interrupt

source.

• AIN1/PCINT3 – Port E, Bit 3

AIN1 – Analog Comparator Negative input. This pin is directly connected to the negative

input of the Analog Comparator.

PCINT3, Pin Change Interrupt Source 3: The PE3 pin can serve as an external interrupt

source.

Table 39. Port E Pins Alternate Functions

Port Pin

Alternate Function

PE7

PCINT7 (Pin Change Interrupt7)

CLKO (Divided System Clock)

PE6

DO/PCINT6 (USI Data Output or Pin Change Interrupt6)

PE5

DI/SDA/PCINT5 (USI Data Input or TWI Serial DAta or Pin Change Interrupt5)

PE4

USCK/SCL/PCINT4 (USART0 External Clock Input/Output or TWI Serial Clock

or Pin Change Interrupt4)

PE3

AIN1/PCINT3 (Analog Comparator Negative Input or Pin Change Interrupt3)

PE2

XCK/AIN0/ PCINT2 (USART0 External Clock or Analog Comparator Positive

Input or Pin Change Interrupt2)

PE1

TXD/PCINT1 (USART0 Transmit Pin or Pin Change Interrupt1)

PE0

RXD/PCINT0 (USART0 Receive Pin or Pin Change Interrupt0)

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