1.  You are using Timer2 and the OC1 module to create a PWM signal.  The OC1RS SFR holds the value 400, and the PWM signal is high (3.3 V) 25% of the time and low (0 V) 75% of the time.  

  (a)  What is the value in the period register SFR PR2?  (Your answer should be within 2 of the correct answer.)
Ans: 1600.

  (b)  If you want to increase the frequency of the PWM signal, which SFR would you change, and how?
Ans:  Decrease PR2.

2.  What is the maximum count that Timer2 (alone) can hold?  You can express your answer with an exponent if that's easier.
Ans:  2^16 -1 = 65535.

3.  What is the purpose of the timer prescaler?
Ans:  To set the ratio of the number of input events (clock pulses or external events) per timer count.

4.  What is the resolution (in bits) of the ADC module?  (i.e., how many bits are in the representation of the sample?)
Ans:  10 bits.

5.  During the sampling stage of an ADC sample, the input must be sampled long enough for the voltage on the internal holding capacitor to stabilize.  Which of these is closest to the minimum recommended time for the sampling stage?  
20 nanoseconds, 200 nanoseconds, 2 microseconds, or 20 microseconds
Ans:  200 nanoseconds.

6.  A transistor has three connections:  collector, base, and emitter.  A phototransistor has only two.  Which of the three connections is missing?
Ans:  The base.