Hi there @abonellitoro,
In the following posts you have several tests underdone by @HermannSW (thansk HermannSW) to know the limits of tc_lib:
- Multi-channel High Frequency PWM with registers and phase shift capabilities - #9 by HermannSW - Arduino Due - Arduino Forum
- Multi-channel High Frequency PWM with registers and phase shift capabilities - #10 by HermannSW - Arduino Due - Arduino Forum
- Multi-channel High Frequency PWM with registers and phase shift capabilities - #12 by HermannSW - Arduino Due - Arduino Forum
- Multi-channel High Frequency PWM with registers and phase shift capabilities - #14 by HermannSW - Arduino Due - Arduino Forum
- Multi-channel High Frequency PWM with registers and phase shift capabilities - #15 by HermannSW - Arduino Due - Arduino Forum
I think they can help you to have a better idea about tc_lib, they report measurements of signals with frequencies greater than 20Mhz.
I hope it helps.