SETTICK period, target [, nbr]
This will setup a periodic interrupt (or "tick"). Four tick timers are available (nbr is 1, 2, 3 or 4). nbr is optional and if not specified timer number 1 will be used. The time between interrupts is period milliseconds and target is the interrupt subroutine which will be called when the timed event occurs. The period can range from 1 to 2147483647 ms (about 24 days).
These interrupts can be disabled by setting period to zero (i.e. SETTICK 0, 0, 3 will disable tick timer number 3).
SETTICK PAUSE, target [, nbr] or
Pause the specified timer. When paused the interrupt is delayed but the current count is maintained.
SETTICK RESUME, target [, nbr]
Resume the specified timer.