ATMEGA640 datasheet(101/449 Pages) ATMEL

101 / 449 page

101

ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

• PDI/RXD0/PCINT8 – Port E, Bit 0

PDI, SPI Serial Programming Data Input. During Serial Program Downloading, this pin

is used as data input line for the ATmega1281/2561. For ATmega640/1280/2560 this

function is placed on MOSI.

RXD0, 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

DDRE0. When the USART0 forces this pin to be an input, a logical one in PORTE0 will

turn on the internal pull-up.

PCINT8, Pin Change Interrupt source 8: The PE0 pin can serve as an external interrupt source.

Table 52 and Table 53 relates the alternate functions of Port E to the overriding signals

shown in Figure 36 on page 89.

Table 52. Overriding Signals for Alternate Functions PE7:PE4

Signal

Name

PE7/INT7/ICP3

PE6/INT6/T3

PE5/INT5/OC3C

PE4/INT4/OC3B

PUOE

PUOV

DDOE

DDOV

PVOE

OC3C ENABLE

OC3B ENABLE

PVOV

OC3C

OC3B

DIEOE

INT7 ENABLE

INT6 ENABLE

INT5 ENABLE

INT4 ENABLE

DIEOV

INT7 INPUT/ICP3

INPUT

INT7 INPUT/T3

INPUT

INT5 INPUT

INT4 INPUT

AIO

–

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