ECE 4760: Homework 4

1. Describe in detail why there is a diode across the motor in lab 4. Include direction of inductive current flow during each part of the PWM cycle.
2. Explain the physics in the Matlab code.
3. What MCU hardware is used by ProtoThreads?
   Can you use timer2 for your own code? How about timer3and timer5?
4. How could you measure the cpu load caused by the motor control ISR running at 1000 Hz?
5. Write the code to set up a timer2 ISR running 1000 times/sec, assuming a cpu clock of 40 MHz.