ATmega162 datasheet(72/324 Pages) ATMEL

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2513K–AVR–07/09

ATmega162/V

Alternate Functions Of

Port B

The Port B pins with alternate functions are shown in Table 32.

The alternate pin configuration is as follows:

• SCK – 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 SPI is

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

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

• MISO – 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

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

• MOSI – 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

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

•SS/OC3B – Port B, Bit 4

SS: Slave 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 by the SPI to be an input, the pull-up can still be controlled by the PORTB4 bit.

OC3B, Output Compare Match B output: The PB4 pin can serve as an external output for the

Timer/Counter3 Output Compare B. The pin has to be configured as an output (DDB4 set (one))

to serve this function. The OC3B pin is also the output pin for the PWM mode timer function.

Table 32. Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

SCK (SPI Bus Serial Clock)

PB6

MISO (SPI Bus Master Input/Slave Output)

PB5

MOSI (SPI Bus Master Output/Slave Input)

PB4

SS (SPI Slave Select Input)

OC3B (Timer/Counter3 Output Compare Match Output)

PB3

AIN1 (Analog Comparator Negative Input)

TXD1 (USART1 Output Pin)

PB2

AIN0 (Analog Comparator Positive Input)

RXD1 (USART1 Input Pin)

PB1

T1 (Timer/Counter1 External Counter Input)

OC2 (Timer/Counter2 Output Compare Match Output)

PB0

T0 (Timer/Counter0 External Counter Input)

OC0 (Timer/Counter0 Output Compare Match Output)

clk

I/O (Divided System Clock)

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