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Write an instruction sequence to generate a 1000 Hz square wave and 40% duty cycle from PWM5 and use center-aligned mode. Assume that the E clock frequency is 24 MHz, and the orescale factor is 16. Assume it is 16-bit mode, stop PWM in wait and freeze mode. Set PWM5 output to start with low level.

Write an instruction sequence to generate a 1000 Hz square wave and 40% duty cycle from PWM5 and use center-aligned mode. Assume that the E clock frequency is 24 MHz, and the orescale factor is 16. Assume it is 16-bit mode, stop PWM in wait and freeze mode. Set PWM5 output to start with low level.

Database System Concepts
Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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**EEEN 3449 - Test #3 - Spring 2021** **Name:_____________** Please PRINT your name clearly. If I cannot read it, I cannot record your score. --- 1. **Instruction Sequence:** Write an instruction sequence to generate a 1000 Hz square wave and 40% duty cycle from PWM5 and use center-aligned mode. Assume that the E clock frequency is 24 MHz, and the prescale factor is 16. Assume it is 16-bit mode, stop PWM in wait and freeze mode. Set PWM5 output to start with low level. **Fill in the blanks for the following:** ``` movb #$20, PWME movb #0, PWMPOL movb #0, PWMCLK movb #$40, PWMPRCLK movb #$20, PWMCAE movb #$4C, PWMCTL movw #750, PWMPER4 movw #450, PWMDTY4 ``` 2. **Explanations:** - **E clock** is at 24 MHz, assume the prescaler = 16 ⇒ Clock B is @ 1.5 MHz. - **Waveform frequency** = 1000 Hz, then the period = \( \frac{1}{1000} \) s. - **# of counts for clock B** in the period is \( \frac{1}{1000} \times 1.5 \times 10^6 = 1500 \). - **Calculations:** \[ \text{[PWMPER2]} = 750 \quad \text{and} \quad \text{[PWMDTY2]} = 750 \times (1 - 40\%) = 450 \]
Transcribed Image Text:**EEEN 3449 - Test #3 - Spring 2021** **Name:_____________** Please PRINT your name clearly. If I cannot read it, I cannot record your score. --- 1. **Instruction Sequence:** Write an instruction sequence to generate a 1000 Hz square wave and 40% duty cycle from PWM5 and use center-aligned mode. Assume that the E clock frequency is 24 MHz, and the prescale factor is 16. Assume it is 16-bit mode, stop PWM in wait and freeze mode. Set PWM5 output to start with low level. **Fill in the blanks for the following:** ``` movb #$20, PWME movb #0, PWMPOL movb #0, PWMCLK movb #$40, PWMPRCLK movb #$20, PWMCAE movb #$4C, PWMCTL movw #750, PWMPER4 movw #450, PWMDTY4 ``` 2. **Explanations:** - **E clock** is at 24 MHz, assume the prescaler = 16 ⇒ Clock B is @ 1.5 MHz. - **Waveform frequency** = 1000 Hz, then the period = \( \frac{1}{1000} \) s. - **# of counts for clock B** in the period is \( \frac{1}{1000} \times 1.5 \times 10^6 = 1500 \). - **Calculations:** \[ \text{[PWMPER2]} = 750 \quad \text{and} \quad \text{[PWMDTY2]} = 750 \times (1 - 40\%) = 450 \]
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