the MCU is out, I'm getting fed up with MCU's at the moment as nothing about C is made simple and when you nearly have your problem solved but for a detail and ask a question on a forum you get told you missed some basic concept and have to go back to learning. Waste of time.
From my school days i seems to remember that I can have a counter that counts to t least what i need and use logic gates to sent out a reset signal at the right count, simples I'll get it done faster with basic digital circuitry than any of the MCU jargons, anythinf complex i'll take to an arduino, sad i know but as it is only with arduino that everything is made easy for idiots like me that is the route i will have to take.
My main concern is that I remeber something about counters not being sycronous and drifting due to propagation delays as one flip/flop clocked another, that is my main concern. What about the HCF4060M013TR ? it has built in oscillator circuitry