ATmega1284P datasheet(80/380 Pages) ATMEL

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8059D–AVR–11/09

ATmega1284P

12.3.2

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 12-6.

The alternate pin configuration is as follows:

• SCK/OC3B/PCINT15 – Port B, Bit 7

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 DDB7. When the SPI0 is

enabled as a master, the data direction of this pin is controlled by DDB7. When the pin is forced

to be an input, the pull-up can still be controlled by the PORTB7 bit.

OC3B, Output Compare Match B output: The PB7 pin can serve as an external output for the

Timer/Counter3 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to

serve this function. The OC3B 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.

• MISO/OC3A/PCINT14 – Port B, Bit 6

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 DDB6. When the SPI is

enabled as a slave, the data direction of this pin is controlled by DDB6. When the pin is forced to

be an input, the pull-up can still be controlled by the PORTB6 bit.

Table 12-6.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

SCK (SPI Bus Master clock input)

OC3B (Timer/Conter 3 Output Compare Match B Output)

PCINT15 (Pin Change Interrupt 15)

PB6

MISO (SPI Bus Master Input/Slave Output)

OC3A (Timer/Conter 3 Output Compare Match A Output)

PCINT14 (Pin Change Interrupt 14)

PB5

MOSI (SPI Bus Master Output/Slave Input)

ICP3 (Timer/Counter3 Input Capture Trigger)

PCINT13 (Pin Change Interrupt 13)

PB4

SS (SPI Slave Select input)

OC0B (Timer/Conter 0 Output Compare Match B Output)

PCINT12 (Pin Change Interrupt 12)

PB3

AIN1 (Analog Comparator Negative Input)

OC0A (Timer/Conter 0 Output Compare Match A Output)

PCINT11 (Pin Change Interrupt 11)

PB2

AIN0 (Analog Comparator Positive Input)

INT2 (External Interrupt 2 Input)

PCINT10 (Pin Change Interrupt 10)

PB1

T1 (Timer/Counter 1 External Counter Input)

CLKO (Divided System Clock Output)

PCINT9 (Pin Change Interrupt 9)

PB0

T0 (Timer/Counter 0 External Counter Input)

XCK0 (USART0 External Clock Input/Output)

PCINT8 (Pin Change Interrupt 8)

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