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1.
Question (TCO #6) How many 16-bit PWM channels are available in the Freescale : 9S12DG256 microcontroller?
Student Answer: Two Four Seven Eight Comments:
2.
Question (TCO #6) When concatenating the two 8-bit PWM Channels 3 and 2 to get a 16-bit : PWM channel, _____ becomes the low-order byte.
Student Answer: Channel 7 Channel 2 Channel 5 Channel 3 Comments:
3.
Question (TCO #6) To enable Channel 7 of the PWM to 9S12DG256, which of the : following must be done?
Student Answer: Set PWME7 = 1 Set PWME7 = 0 Set CAE7 = 1 Set CAE7 = 0 Comments:
4. Question : (TCO #6) What is Clock SA when PWMSCLA = 0x01 and Clock A = 4MHz? Student Answer: 5MHz 4MHz 8MHz 2MHz Comments:
5. Question : (TCO #6) What is Clock SA when PWMSCLA = 0x00 and Clock A = 8MHz? Student Answer: 8MHz 15625Hz 8MHz 31250Hz Comments:
6.
Question (TCO #6) A bus clock is set to 4000 kHz. What is the Clock A’s value if : PWMPRCLK = 0x02?
Student Answer: 1MHz 3MHz 2MHz 8MHz
Comments:
7.
Question (TCO #6) In case of center-aligned PWM, which formula can be used for the duty : cycle of the output waveform?
Student Answer:
Duty Cycle = [(PWMPERx - PWMDTYx) / PWMPERx] * 100%
Duty Cycle = [PWMDTYx / PWMPERx] * 100% Duty Cycle = PWMDTYx 100% Both A or B (depends on PPOLx) Comments:
8.
Question (TCO #6) In case of center-aligned PWM, which formula can be used for the : PWM frequency?
Student Answer:
PWMx frequency = Clock (A, B, SA, or SB) / PWMPERx
PWMx frequency = Clock (A, B, SA, or SB) / (2 * PWMPERx) PWMx frequency = Clock (A, B, SA, or SB) / (4 * PWMPERx) PWMx frequency = Clock (A, B, SA, or SB) / (3 * PWMPERx) Comments:
9.
Question (TCO #6) Current passing through a wire creates an electromagnetic field that : _____.
Student Answer: is directly proportional to the amount of the current flowing inside the wire is strongest closer to the wire
loops around the wire
satisfies all of the above answers Comments:
10.
Question (TCO #6) PWM channels of a microcontroller are designed for control of a : _____.
Student Answer: servo motor AC motor stepper motor None of the above