ATMEGA640 datasheet(77/436 Pages) MICROCHIP

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

DS40002211A

• OC1B/PCINT6, Bit 6

OC1B, Output Compare Match B output: The PB6 pin can serve as an external output for the Timer/Counter1 Out-

put Compare B. The pin has to be configured as an output (DDB6 set (one)) to serve this function. The OC1B pin is

also the output pin for the PWM mode timer function.

PCINT6, Pin Change Interrupt source 6: The PB6 pin can serve as an external interrupt source.

• OC1A/PCINT5, Bit 5

OC1A, Output Compare Match A output: The PB5 pin can serve as an external output for the Timer/Counter1 Out-

put Compare A. The pin has to be configured as an output (DDB5 set (one)) to serve this function. The OC1A pin is

also the output pin for the PWM mode timer function.

PCINT5, Pin Change Interrupt source 5: The PB5 pin can serve as an external interrupt source.

• OC2A/PCINT4, Bit 4

OC2A, Output Compare Match output: The PB4 pin can serve as an external output for the Timer/Counter2 Output

Compare. The pin has to be configured as an output (DDB4 set (one)) to serve this function. The OC2A pin is also

the output pin for the PWM mode timer function.

PCINT4, Pin Change Interrupt source 4: The PB4 pin can serve as an external interrupt source.

• MISO/PCINT3 – Port B, Bit 3

MISO: Master Data input, Slave Data output pin for SPI channel. When the SPI is enabled as a master, this pin is

configured as an input regardless of the setting of DDB3. When the SPI is enabled as a slave, the data direction of

this pin is controlled by DDB3. When the pin is forced to be an input, the pull-up can still be controlled by the

PORTB3 bit.

PCINT3, Pin Change Interrupt source 3: The PB3 pin can serve as an external interrupt source.

• MOSI/PCINT2 – Port B, Bit 2

MOSI: SPI Master Data output, Slave Data input for SPI channel. When the SPI is enabled as a slave, this pin is

configured as an input regardless of the setting of DDB2. When the SPI is enabled as a master, the data direction

of this pin is controlled by DDB2. When the pin is forced to be an input, the pull-up can still be controlled by the

PORTB2 bit.

PCINT2, Pin Change Interrupt source 2: The PB2 pin can serve as an external interrupt source.

• SCK/PCINT1 – Port B, Bit 1

SCK: Master Clock output, Slave Clock input pin for SPI channel. When the SPI is enabled as a slave, this pin is

configured as an input regardless of the setting of DDB1. When the SPI0 is enabled as a master, the data direction

of this pin is controlled by DDB1. When the pin is forced to be an input, the pull-up can still be controlled by the

PORTB1 bit.

PCINT1, Pin Change Interrupt source 1: The PB1 pin can serve as an external interrupt source.

•SS/PCINT0 – Port B, Bit 0

SS: Slave Port Select input. When the SPI is enabled as a slave, this pin is configured as an input regardless of the

setting of DDB0. As a slave, the SPI is activated when this pin is driven low. When the SPI is enabled as a master,

the data direction of this pin is controlled by DDB0. When the pin is forced to be an input, the pull-up can still be

controlled by the PORTB0 bit.

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