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

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:

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

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

Photos

ECET365 Week 6 Quiz
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