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ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
• OC1A: Output Compare Match output: The PB1 pin can serve as an external output for the Timer/Counter1
Compare Match B when configured as an output (DDB1 set). The OC1A pin is also the output pin for the PWM
mode timer function.
• DO: Three-wire mode Universal Serial Interface Data output. Three-wire mode Data output overrides PORTB1
value and it is driven to the port when data direction bit DDB1 is set (one). PORTB1 still enables the pull-up, if
the direction is input and PORTB1 is set (one).
• PCINT1: Pin Change Interrupt source 1.
• Port B, Bit 0 – MOSI/AIN0/OC0A/OC1A
/DI/SDA/AREF/PCINT0
• 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 DDB0. When the SPI is enabled as a Master, the data
direction of this pin is controlled by DDB0. When the pin is forced by the SPI to be an input, the pull-up can still
be controlled by the PORTB0 bit.
• AIN0: Analog Comparator Positive Input. Configure the port pin as input with the internal pull-up switched off to
avoid the digital port function from interfering with the function of the Analog Comparator.
• OC0A: Output Compare Match output. The PB0 pin can serve as an external output for the Timer/Counter0
Compare Match A when configured as an output (DDB0 set (one)). The OC0A pin is also the output pin for the
PWM mode timer function.
•OC1A
: Inverted Output Compare Match output: The PB0 pin can serve as an external output for the
Timer/Counter1 Compare Match B when configured as an output (DDB0 set). The OC1A
pin is also the inverted
output pin for the PWM mode timer function.
• SDA: Two-wire mode Serial Interface Data.
• AREF: External Analog Reference for ADC. Pullup and output driver are disabled on PB0 when the pin is used
as an external reference or Internal Voltage Reference with external capacitor at the AREF pin.
• DI: Data Input in USI Three-wire mode. USI Three-wire mode does not override normal port functions, so pin
must be configure as an input for DI function.
• PCINT0: Pin Change Interrupt source 0.
Table 10-4 and Table 10-5 relate the alternate functions of Port B to the overriding signals shown in Figure 10-5 on
page 58.