Datasheet

60
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
10.3.1 Alternate Functions of Port B
The Port B pins with alternate function are shown in Table 10-3.
• Port B, Bit 5 – RESET
/dW/ADC0/PCINT5
• RESET
: External Reset input is active low and enabled by unprogramming (“1”) the RSTDISBL Fuse. Pullup is
activated and output driver and digital input are deactivated when the pin is used as the RESET
pin.
• dW: When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are unprogrammed, the
debugWIRE system within the target device is activated. The RESET
port pin is configured as a wire-AND
(open-drain) bi-directional I/O pin with pull-up enabled and becomes the communication gateway between
target and emulator.
• ADC0: Analog to Digital Converter, Channel 0
.
• PCINT5: Pin Change Interrupt source 5.
Table 10-3. Port B Pins Alternate Functions
Port Pin Alternate Function
PB5
RESET
:Reset Pin
dW: debugWIRE I/O
ADC0: ADC Input Channel 0
PCINT5: Pin Change Interrupt, Source 5
PB4
XTAL2: Crystal Oscillator Output
CLKO: System Clock Output
ADC2: ADC Input Channel 2
OC1B: Timer/Counter1 Compare Match B Output
PCINT4: Pin Change Interrupt 0, Source 4
PB3
XTAL1: Crystal Oscillator Input
CLKI: External Clock Input
ADC3: ADC Input Channel 3
OC1B: Complementary Timer/Counter1 Compare Match B Output
PCINT3: Pin Change Interrupt 0, Source 3
PB2
SCK: Serial Clock Input
ADC1: ADC Input Channel 1
T0: Timer/Counter0 Clock Source
USCK: USI Clock (Three Wire Mode)
SCL : USI Clock (Two Wire Mode)
INT0: External Interrupt 0 Input
PCINT2: Pin Change Interrupt 0, Source 2
PB1
MISO: SPI Master Data Input / Slave Data Output
AIN1: Analog Comparator, Negative Input
OC0B: Timer/Counter0 Compare Match B Output
OC1A: Timer/Counter1 Compare Match A Output
DO: USI Data Output (Three Wire Mode)
PCINT1:Pin Change Interrupt 0, Source 1
PB0
MOSI:: SPI Master Data Output / Slave Data Input
AIN0: Analog Comparator, Positive Input
OC0A: Timer/Counter0 Compare Match A output
OC1A
: Complementary Timer/Counter1 Compare Match A Output
DI: USI Data Input (Three Wire Mode)
SDA: USI Data Input (Two Wire Mode)
AREF: External Analog Reference
PCINT0: Pin Change Interrupt 0, Source 0