Yes, I can explain you this discussion...
One RC system itīs cheaper than a Crystal.
My system itīs not critical, I donīt need such an accurate timing, but I need accurate enough... For example in 9m50s I donīt mind having 9m47, but I do mind having 9m40s.
My doubt was if with one crystal I woul have 9m50s and with an RC 9m47.
If it was the case I would prefer an RC system, but I already see it isnīt.
Regards
Leonel Monteiro