ATMEGA640 datasheet(82/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Note:

1. When enabled, the 2-wire Serial Interface enables Slew-Rate controls on the output pins PD0 and PD1. This is not

shown in this table. In addition, spike filters are connected between the AIO outputs shown in the port figure and

the digital logic of the TWI module.

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.

Table 13-14. Overriding Signals for Alternate Functions in PD3:PD0(1)

Signal Name

PD3/INT3/TXD1

PD2/INT2/RXD1

PD1/INT1/SDA

PD0/INT0/SCL

PUOE

TXEN1

RXEN1

TWEN

PUOV

PORTD2 • PUD

PORTD1 • PUD

PORTD0 • PUD

DDOE

TXEN1

RXEN1

TWEN

DDOV

SDA_OUT

SCL_OUT

PVOE

TXEN1

TWEN

PVOV

TXD1

DIEOE

INT3 ENABLE

INT2 ENABLE

INT1 ENABLE

INT0 ENABLE

DIEOV

INT3 INPUT

INT2 INPUT/RXD1

INT1 INPUT

INT0 INPUT

AIO

–

SDA INPUT

SCL INPUT

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)

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