# ECET365 Week 6 Quiz

 1 Question : (TCO #6) How many 16-bit PWM channels are available in the Freescale 9S12DG256 microcontroller?
 Student Answer: Two Four Seven Eight
 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
 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
 4 Question : (TCO #6) What is Clock SA when PWMSCLA = 0x01 and Clock A = 4MHz?
 Student Answer: 5MHz 4MHz 8MHz 2MHz
 5 Question : (TCO #6) What is Clock SA when PWMSCLA = 0x00 and Clock A = 8MHz?
 Student Answer: 8MHz 15625Hz 8MHz 31250Hz
 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
 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)
 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)
 9 Question : (TCO #6) Current passing through a wire creates an electromagnetic field that _____.
 Student Answer: loops around the wire is directly proportional to the amount of the current flowing inside the wire is strongest closer to the wire satisfies all of the above answers
 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

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