1 Pin Functionality Difference

ATtiny102/104 features additional pins than ATtiny4/5/9/10. ATtiny102/104 has both PORTA and PORTB whereas ATtiny4/5/9/10 have only PORTB.

ATtiny102/104 contains additional GPIOs. ATtiny102 is an 8-pin device with 6 GPIOs. ATtiny104 is a 14-pin device with 12 GPIOs.

Table 1-1. Port Pin Functionality Difference between ATtiny102/104 and ATtiny4/5/9/10
Port pinATtiny102/104ATtiny4/5/9/10
PB[0]ADC4 / PCINT8ADC0 / AIN0 / OC0A / PCINT0 / TPIDATA
PB[1]ADC5 / OC0A / PCINT9 / INT0 / CLKOADC1 / AIN1 / CLKI / ICP0 / OC0B / PCINT1 / TPICLK
PB[2]ADC6 / ICP0 / TxD0 / PCINT10ADC2 / CLKO / INT0 / PCINT2 / T0
PB[3]ACO / ADC7 / T0 / RxD0 / PCINT11ADC3 / PCINT3 / RESET
Note:
  • PB [0] PORTB Pin 0 is not present in ATtiny102.
  • The code that is built for your existing ATtiny4/5/9/10 will continue to successfully build on the new ATtiny104 device. But, such existing code may not build for ATtiny102 - if the code uses the PORTB Pin 0. To ensure the working of the code, the differences in the pin functionalities must be noted.
.