Question

Counters must have a separate input or instruction to reset. How would you assure that all counters are reset and their accumulators show 0 when you start a process?

Answer 1

In the begining of process you can add a routine which checks if the values of counters you want to use are zero. if ther are not then add a reset instruction. Also save the counter value to some other variable/register before setting it zero as other process might be using them. Follwing is the pseudo code of the routine to make sure counters are zero.

counter_check()
{

If counter_value is 0:
continue;
else:
counter_old = counter_value;
counter_value = 0;

}

Make a routine to set back the old value of counter

counter_setback()
{
counter_value = counter_old;
}

You can call this routine at the beginin of your process

process()
{
counter_check()
........
........
........
counter_setback()
}

I hope you get the idea. You can easily convert the pseudo code in assembly language by using conditional jumps,call, MOV and reset instructions wherever required.