OC0A: Timer/Counter0 Compare Match A output MOSI: SPI Master Data Output / Slave Data Input
OC1B: Timer/Counter1 Compare Match B Output ATtiny85 pin description for each pin is given in below table: Most of the I/O pins of the chip have more than one function. This microcontroller chip features 8KB ISP flash memory, 512B EEPROM, 512-Byte SRAM, 6 general-purpose I/O lines, 32 general purpose working registers, one 8-bit timer/counter with compare modes, one 8-bit high-speed timer/counter, USI, internal and external Interrupts, 4-channel 10-bit A/D converter, programmable watchdog timer with internal oscillator, three software selectable power saving modes, and debugWIRE for on-chip debugging.
Components Required to Program ATtiny85 through USB