ATmega32A datasheet(59/352 Pages) ATMEL

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8155B–AVR–07/09

ATmega32A

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 – Port B, Bit 7

SCK: Master Clock output, Slave Clock input pin for SPI. 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. 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.

Table 12-5.

Overriding Signals for Alternate Functions in PA3:PA0

Signal Name

PA3/ADC3

PA2/ADC2

PA1/ADC1

PA0/ADC0

PUOE

PUOV

DDOE

DDOV

PVOE

PVOV

DIEOE

DIEOV

––

AIO

ADC3 INPUT

ADC2 INPUT

ADC1 INPUT

ADC0 INPUT

Table 12-6.

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)

PB3

AIN1 (Analog Comparator Negative Input)

OC0 (Timer/Counter0 Output Compare Match Output)

PB2

AIN0 (Analog Comparator Positive Input)

INT2 (External Interrupt 2 Input)

PB1

T1 (Timer/Counter1 External Counter Input)

PB0

T0 (Timer/Counter0 External Counter Input)

XCK (USART External Clock Input/Output)

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