Servo8bit is a library for AVR microcontrollers ... for smaller chips that only have 8-bit timers and it is specifically targeted at the ATtiny45 and ATtiny85 microcontrollers.

Doing so will force the TX signal ground to be the same as the ATTiny’s and in some cases may put 48V on your AVR if your ... that the microcontroller is clocked at 20Mhz to bit-bang the ...