Timers Chapter 10. Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue.

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Presentation transcript:

Timers Chapter 10

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Timers (cont.) Pulse Train Using Interrupts Measuring the Period of a Pulse Train Using Interrupts The Polaroid Ultrasonic Transducer –An Ultrasonic Tape Measure

Timer Counter

Timer System Control Register

Setting the timer count time

68HC11 Timer Registers

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Pulse Train Example

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Input Capture

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Pulse Accumulator

The 74C Key Encoder Connect pin 12 to PT7/PAI instead of PJ7

Pulse Accumulator on a 68HC11

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Timing Interrupt Service Routines Traffic Lights Using Real-time Interrupt

Copy TRAFFIC.WHP to TRAFFIC2.WHP

Load TRAFFIC2.WHP TEST.SETUP TEST Add:

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

A Circular Queue empty Containing 2 values

Timers The 68HC12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Timers (cont.) Pulse Train Using Interrupts Measuring the Period of a Pulse Train Using Interrupts The Polaroid Ultrasonic Transducer –An Ultrasonic Tape Measure

Pulse Train

Timers (cont.) Pulse Train Using Interrupts Measuring the Period of a Pulse Train Using Interrupts The Polaroid Ultrasonic Transducer –An Ultrasonic Tape Measure

Timers (cont.) Pulse Train Using Interrupts Measuring the Period of a Pulse Train Using Interrupts The Polaroid Ultrasonic Transducer –An Ultrasonic Tape Measure

Polaroid Ultrasonic Ranging System

Waveforms of Ultrasonic Ranging System

Exercises