Datasheet

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ATmega164A/PA/324A/PA/644A/PA/1284/P

 2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 90

• 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.

• T0/XCK0/PCINT8, Bit 0

T0, Timer/Counter0 counter source.

XCK0, USART0 External clock. The Data Direction Register (DDB0) controls whether the clock is output (DDD0

set “one”) or input (DDD0 cleared). The XCK0 pin is active only when the USART0 operates in Synchronous

mode.

PCINT8, Pin Change Interrupt source 8: The PB0 pin can serve as an external interrupt source.

Table 14-7 and Table 14-8 relate the alternate functions of Port B to the overriding signals shown in Figure 14-5

on page 85. SPI MSTR INPUT and SPI SLAVE OUTPUT constitute the MISO signal, while MOSI is divided into

SPI MSTR OUTPUT and SPI SLAVE INPUT.

Table 14-7. Overriding Signals for Alternate Functions in PB7:PB4

Signal

name

PB7/SCK/

PCINT15

PB6/MISO/

PCINT14

PB5/MOSI/

PCINT13

PB4/SS/OC0B/

PCINT12

PUOE SPE • MSTR SPE • MSTR SPE • MSTR SPE • MSTR

PUOV PORTB7 • PUD PORTB14 • PUD PORTB13 • PUD PORTB12 • PUD

DDOE SPE • MSTR SPE • MSTR SPE • MSTR SPE • MSTR

DDOV 0 0 0 0

PVOE SPE • MSTR SPE • MSTR SPE • MSTR OC0A ENABLE

PVOV SCK OUTPUT

SPI SLAVE

OUTPUT

SPI MSTR OUTPUT OC0A

DIEOE PCINT15 • PCIE1 PCINT14 • PCIE1 PCINT13 • PCIE1 PCINT12 • PCIE1

DIEOV 1 1 1 1

SCK INPUT

PCINT17 INPUT

SPI MSTR INPUT

PCINT14 INPUT

SPI SLAVE INPUT

PCINT13 INPUT

SPI SS

PCINT12 INPUT

AIO – – – –