ATmega325P datasheet(71/364 Pages) ATMEL

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8023F–AVR–07/09

ATmega325P/3250P

13.3.1

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 13-3.

The alternate pin configuration is as follows:

• OC2A/PCINT15, Bit 7

OC2, Output Compare Match A output: The PB7 pin can serve as an external output for the

Timer/Counter2 Output Compare A. The pin has to be configured as an output (DDB7 set (one))

to serve this function. The OC2A pin is also the output pin for the PWM mode timer function.

PCINT15, Pin Change Interrupt source 15: The PB7 pin can serve as an external interrupt

source.

• OC1B/PCINT14, Bit 6

OC1B, Output Compare Match B output: The PB6 pin can serve as an external output for the

Timer/Counter1 Output 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.

PCINT14, Pin Change Interrupt Source 14: The PB6 pin can serve as an external interrupt

source.

• OC1A/PCINT13, Bit 5

OC1A, Output Compare Match A output: The PB5 pin can serve as an external output for the

Timer/Counter1 Output 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.

PCINT13, Pin Change Interrupt Source 13: The PB5 pin can serve as an external interrupt

source.

• OC0A/PCINT12, Bit 4

OC0A, Output Compare Match A output: The PB4 pin can serve as an external output for the

Timer/Counter0 Output Compare A. The pin has to be configured as an output (DDB4 set (one))

to serve this function. The OC0A pin is also the output pin for the PWM mode timer function.

Table 13-3.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC2A/PCINT15 (Output Compare and PWM Output A for Timer/Counter2 or Pin

Change Interrupt15).

PB6

OC1B/PCINT14 (Output Compare and PWM Output B for Timer/Counter1 or Pin

Change Interrupt14).

PB5

OC1A/PCINT13 (Output Compare and PWM Output A for Timer/Counter1 or Pin

Change Interrupt13).

PB4

OC0A/PCINT12 (Output Compare and PWM Output A for Timer/Counter0 or Pin

Change Interrupt12).

PB3

MISO/PCINT11 (SPI Bus Master Input/Slave Output or Pin Change Interrupt11).

PB2

MOSI/PCINT10 (SPI Bus Master Output/Slave Input or Pin Change Interrupt10).

PB1

SCK/PCINT9 (SPI Bus Serial Clock or Pin Change Interrupt9).

PB0

SS/PCINT8 (SPI Slave Select input or Pin Change Interrupt8).

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