Exercise7 - 0306-250 Assembly Language Programming Fall...

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Page 1 of 3 0306-250 Assembly Language Programming Fall 2009 Laboratory Exercise Seven: A/D Conversion, PWM, and Servos This exercise investigates analog-to-digital (A/D) conversion and pulse-width modulation (PWM) on the Freescale HCS12 MCU Application Module using the HCS12 analog-to- digital block (ATD) and pulse-width modulation module (PWM). A PWM waveform from the HCS12 is used to set the position of a Futaba S3003 servo. The objective of this exercise is to take a digital value converted from an analog input and to use it to set a servo to one of five positions. An assembly language program is created and is executed on the HSC12 module. Prelab Work 1. Write code to initialize the HSC12 ATD for polled conversion of channel 3 (AN3) to an unsigned 10-bit value right-justified in a word. Follow the class notes on the ATD posted on myCourses under Content ° Course Resources . The notes also describe the wiring necessary for this exercise. 2. Write code to initialize the HSC12 PWM to produce on channel 0 a waveform with a 20-ms period and with a duty period of 2 ms. Follow the class notes on the PWM posted on myCourses under Content ° Course Resources. The notes also describe the hardware configuration and wiring necessary for this exercise.
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