manupulation of high and low times

with an inability of dealing with the division in the ISR, I need to do the division each sample time.

Nic explained to me that I need to be careful to avoid having an interrupt change the high and low times while I am doing the division. That should be done with flags and a buffer that stores an alternate value of the high and low times.

As I cannot figure out how to do that in simulink, my first idea was to use a memory block. In that way the previous value of the high and low times would be stored,

THAT DID NOT WORK AND IT IS TIME TO GO HOME.