Here is a short effort to program the control of crystal frequency output. 8MHz as the standing frequency with multipliers asserted one at a time.
This is an experiment to encode in binary a selectable output pulse rate from a 555 timer. Where selected GPIO pins become asserted to set the desired rate. Over an Uno connection with code, I set up a user interface to push millions of pulses through to a defined output. All in a single second each instance. Staring from a single pulse rate with multipliers of 16, 20, 32, and 40. Each one separately is chosen by simply entering what a user wants over a GUI interface.
