ATmega1284P datasheet(85/468 Pages) ATMEL

85 / 468 page

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

• MOSI/PCINT13 – Port B, Bit 5

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 DDB5. When the SPI is

enabled as a master, the data direction of this pin is controlled by DDB5. When the pin is forced

to be an input, the pull-up can still be controlled by the PORTB5 bit.

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

source.

•SS/OC0B/PCINT12 – Port B, Bit 4

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 DDB4. 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 DDB4.

When the pin is forced to be an input, the pull-up can still be controlled by the PORTB4 bit.

OC0B, Output Compare Match B output: The PB4 pin can serve as an external output for the

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

serve this function. The OC0B pin is also the output pin for the PWM mode timer function.

PCINT12, Pin Change Interrupt source 12: The PB4 pin can serve as an external interrupt

source.

• AIN1/OC0A/PCINT11, Bit 3

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

the Analog Comparator.

OC0A, Output Compare Match A output: The PB3 pin can serve as an external output for the

Timer/Counter0 Output Compare. The pin has to be configured as an output (DDB3 set “one”) to

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

PCINT11, Pin Change Interrupt source 11: The PB3 pin can serve as an external interrupt

source.

• AIN0/INT2/PCINT10, Bit 2

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

the Analog Comparator.

INT2, External Interrupt source 2. The PB2 pin can serve as an External Interrupt source to the

MCU.

PCINT10, Pin Change Interrupt source 10: The PB2 pin can serve as an external interrupt

source.

• T1/CLKO/PCINT9, Bit 1

T1, Timer/Counter1 counter source.

CLKO, Divided System Clock: The divided system clock can be output on the PB1 pin. The

divided system clock will be output if the CKOUT Fuse is programmed, regardless of the

PORTB1 and DDB1 settings. It will also be output during reset.

PCINT9, Pin Change Interrupt source 9: The PB1 pin can serve as an external interrupt source.

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