ATmega1284P datasheet(84/468 Pages) ATMEL

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8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

13.3.2

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 13-6.

The alternate pin configuration is as follows:

• SCK/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.

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

source.

• MISO/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.

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

source.

Table 13-6.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

SCK (SPI Bus Master clock input)

PCINT15 (Pin Change Interrupt 15)

PB6

MISO (SPI Bus Master Input/Slave Output)

PCINT14 (Pin Change Interrupt 14)

PB5

MOSI (SPI Bus Master Output/Slave Input)

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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