ATMEGA640 datasheet(83/436 Pages) MICROCHIP

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

DS40002211A

• 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 out-

put 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 Out-

put 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.

• INT4/OC3B – Port E, Bit 4

INT4, External Interrupt source 4: The PE4 pin can serve as an External Interrupt source.

OC3B, Output Compare Match B output: The PE4 pin can serve as an External output for the Timer/Counter3 Out-

put Compare B. The pin has to be configured as an output (DDE4 set (one)) to serve this function. The OC3B pin is

also the output pin for the PWM mode timer function.

• AIN1/OC3A – Port E, Bit 3

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

Comparator.

OC3A, Output Compare Match A output: The PE3 pin can serve as an External output for the Timer/Counter3 Out-

put Compare A. The pin has to be configured as an output (DDE3 set “one”) to serve this function. The OC3A pin is

also the output pin for the PWM mode timer function.

• AIN0/XCK0 – Port E, Bit 2

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

Comparator.

XCK0, USART0 External clock. The Data Direction Register (DDE2) controls whether the clock is output (DDE2

set) or input (DDE2 cleared). The XCK0 pin is active only when the USART0 operates in Synchronous mode.

• PDO/TXD0 – Port E, Bit 1

PDO, SPI Serial Programming Data Output. During Serial Program Downloading, this pin is used as data output

line for the ATmega1281/2561. For ATmega640/1280/2560 this function is placed on MISO.

TXD0, USART0 Transmit pin.

ATMEGA640 Datasheet(PDF) 83 Page - Microchip Technology