QUESTION 3. (10 points) Each time an event occurs (e.g. button push), the program needs to time a duration of 0.25 seconds (using ACLK=32 KHz) and raise an interrupt when this duration elapses. Note that this interval is timed only when the event occurs, not repeatedly back-to-back. Part a) Can we set this up using the up mode? If yes, explain how. Part b) Can we set this up using the continuous mode? If yes, explain how. Part c) If both modes are possible, explain the preferable mode. Part d) If the timer is used intermittently, is it possible to turn the timer on/off throughout the program? How is this done?