Making an Arduino shield can be simpler than you think. This time I designed one to program Attiny and Atmega ...

This should be useful when burning any bootloader using an Arduino. But it does make us wonder if there isn’t an alternative method that would let you draw the clock signal from the Arduino itself?

The Arduino IDE provides access to these through a function in tools called ‘Burn bootloader’ (available in the Tools menu). In proper Arduinos, this sets appropriate non-volatile flags and downloads ...

[Walter]’s device was based upon the Arduino Leonardo. Starting with the Caterina bootloader, modifications were made to enable the device to be locked and unlocked for programming.