ATMEGA649 datasheet(76/375 Pages) ATMEL

76 / 375 page

ATmega329/3210/649/6410

2552H–AVR–11/06

• XCK/AIN0/PCINT2 – Port E, Bit 2

XCK, USART0 External Clock. The Data Direction Register (DDE2) controls whether

the clock is output (DDE2 set) or input (DDE2 cleared). The XCK pin is active only when

the USART0 operates in synchronous mode.

AIN0 – Analog Comparator Positive input. This pin is directly connected to the positive

input of the Analog Comparator.

PCINT2, Pin Change Interrupt Source 2: The PE2 pin can serve as an external interrupt

source.

• TXD/PCINT1 – Port E, Bit 1

TXD0, UART0 Transmit pin.

PCINT1, Pin Change Interrupt Source 1: The PE1 pin can serve as an external interrupt

source.

• RXD/PCINT0 – Port E, Bit 0

RXD, USART0 Receive pin. Receive Data (Data input pin for the USART0). When the

USART0 Receiver is enabled this pin is configured as an input regardless of the value of

DDE0. When the USART0 forces this pin to be an input, a logical one in PORTE0 will

turn on the internal pull-up.

PCINT0, Pin Change Interrupt Source 0: The PE0 pin can serve as an external interrupt

source.

Table 40 and Table 41 relates the alternate functions of Port E to the overriding signals

shown in Figure 27 on page 65.

Note:

1. CKOUT is one if the CKOUT Fuse is programmed

Table 40. Overriding Signals for Alternate Functions PE7:PE4

Signal

Name

PE7/PCINT7

PE6/DO/

PCINT6

PE5/DI/SDA/

PCINT5

PE4/USCK/SCL/

PCINT4

PUOE

USI_TWO-WIRE

PUOV

000

DDOE

CKOUT(1)

USI_TWO-WIRE

DDOV

(SDA +

PORTE5) •

DDE5

(USI_SCL_HOL

D + PORTE4) •

DDE4

PVOE

CKOUT(1)

USI_THREE-

WIRE

USI_TWO-WIRE

• DDE5

USI_TWO-WIRE

• DDE4

PVOV

clk

I/O

PTOE

–

USITC

DIEOE

PCINT7 • PCIE0

PCINT6 • PCIE0

(PCINT5 •

PCIE0) + USISIE

(PCINT4 •

PCIE0) + USISIE

DIEOV

111

PCINT7 INPUT

PCINT6 INPUT

DI/SDA INPUT

PCINT5 INPUT

USCKL/SCL

INPUT

PCINT4 INPUT

AIO

–––

–

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