2 Enhancement and Added Features
Compared to existing ATtiny4/5/9/10 the following enhancements or additional features are available in ATtiny102/104.
- Self-programming flash
 - USART module
 - Shorter startup time
 - Improved Internal 8MHz RC Oscillator accuracy
 - Improved ADC Module
 - Bandgap Reference Connected to Analog Comparator
 - Additional Pin Change Interrupt
 
