ATmega32U2 datasheet(74/314 Pages) ATMEL

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7799B–AVR–07/09

ATmega8U2/16U2/32U2

12.3.1

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 12-3.

The alternate pin configuration is as follows:

• OC0A/OC1C/PCINT7, Bit 7

OC0A, Output Compare Match A output: The PB7 pin can serve as an external output for the

Timer/Counter0 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to

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

OC1C, Output Compare Match C output: The PB7 pin can serve as an external output for the

Timer/Counter1 Output Compare C. The pin has to be configured as an output (DDB7 set “one”)

to serve this function. The OC1C pin is also the output pin for the PWM mode timer function.

PCINT7, Pin Change Interrupt source 7: The PB7 pin can serve as an external interrupt source.

• PCINT6, Bit 6

PCINT6, Pin Change Interrupt source 6: The PB6 pin can serve as an external interrupt source.

• PCINT5, Bit 5

PCINT5, Pin Change Interrupt source 5: The PB5 pin can serve as an external interrupt source.

• T1/PCINT4, Bit 4

T1, Timer/Counter1 counter source.

PCINT4, Pin Change Interrupt source 4: The PB4 pin can serve as an external interrupt source.

• PDO/MISO/PCINT3 – Port B, Bit 3

PDO, SPI Serial Programming Data Output. During Serial Program Downloading, this pin is

used as data output line for the AT90USB82/162.

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 DDB3. When the SPI is

enabled as a slave, the data direction of this pin is controlled by DDB3. When the pin is forced to

be an input, the pull-up can still be controlled by the PORTB3 bit.

PCINT3, Pin Change Interrupt source 3: The PB3 pin can serve as an external interrupt source.

Table 12-3.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC0A/OC1C/PCINT7 (Output Compare and PWM Output A for Timer/Counter0, Output

Compare and PWM Output C for Timer/Counter1 or Pin Change Interrupt 7)

PB6

PCINT6 (Pin Change Interrupt 6)

PB5

PCINT5 (Pin Change Interrupt 5)

PB4

T1/PCINT4 (Timer/Counter1 Clock Input or Pin Change Interrupt 4)

PB3

PDO/MISO/PCINT3 (Programming Data Output or SPI Bus Master Input/Slave Output or

Pin Change Interrupt 3)

PB2

PDI/MOSI/PCINT2 (Programming Data Input or SPI Bus Master Output/Slave Input or Pin

Change Interrupt 2)

PB1

SCLK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)

PB0

SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)

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