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.
• OC1B/PCINT6, Bit 6
OC1B, Output Compare Match B output: The PB6 pin can serve as an external output for the
Timer/Counter1 Output Compare B. The pin has to be configured as an output (DDB6 set (one))
to serve this function. The OC1B pin is also the output pin for the PWM mode timer function.
PCINT6, Pin Change Interrupt source 6: The PB7 pin can serve as an external interrupt source.
• OC1A/PCINT5, Bit 5
OC1A, Output Compare Match A output: The PB5 pin can serve as an external output for the
Timer/Counter1 Output Compare A. The pin has to be configured as an output (DDB5 set (one))
to serve this function. The OC1A pin is also the output pin for the PWM mode timer function.
PCINT5, Pin Change Interrupt source 5: The PB7 pin can serve as an external interrupt source.
• OC2A/PCINT4, Bit 4
OC2A, Output Compare Match output: The PB4 pin can serve as an external output for the
Timer/Counter2 Output Compare. The pin has to be configured as an output (DDB4 set (one)) to
serve this function. The OC2A pin is also the output pin for the PWM mode timer function.
PCINT4, Pin Change Interrupt source 4: The PB7 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 AT90USB64/128.
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 PB7 pin can serve as an external interrupt source.
• PDI/MOSI/PCINT2 – Port B, Bit 2
PDI, SPI Serial Programming Data Input. During Serial Program Downloading, this pin is used
as data input line for the AT90USB64/128.
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 DDB2. When the SPI is
enabled as a master, the data direction of this pin is controlled by DDB2. When the pin is forced
to be an input, the pull-up can still be controlled by the PORTB2 bit.
PCINT2, Pin Change Interrupt source 2: The PB7 pin can serve as an external interrupt source.
• SCK/PCINT1 – Port B, Bit 1
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 DDB1. When the SPI0 is
enabled as a master, the data direction of this pin is controlled by DDB1. When the pin is forced
to be an input, the pull-up can still be controlled by the PORTB1 bit.
82
AT90USB64/128
7593A–AVR–02/06
ATMEL [ ATMEL ]
