This feature enables your device to enter bootloader mode when a CDC ACM port is opened at 1200 baud rate. This is compatible with the Arduino bootloader trigger mechanism used by many tools like ...

What steps will reproduce the problem? 1.test the "Blink" script for tiny25, Blink's pin is No.4. 2.compile is ok. 3.and upload fail! list the follow message: avrdude: please define PAGEL and BS2 ...