Timers Chapter 10 Timers The 68 HC 12

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Timers Chapter 10

Timers Chapter 10

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 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

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 Counter

Timer System Control Register

Timer System Control Register

Setting the timer count time

Setting the timer count time

68 HC 11 Timer Registers

68 HC 11 Timer Registers

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Pulse Train Example

Pulse Train Example

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Input Capture

Input Capture

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse Accumulator Timing Interrupt Service Routines A Circular Queue Data Structure Keypad Interfacing Using Interrupts

Pulse Accumulator

Pulse Accumulator

The 74 C 922 16 -Key Encoder Connect pin 12 to PT 7/PAI instead

The 74 C 922 16 -Key Encoder Connect pin 12 to PT 7/PAI instead of PJ 7

Pulse Accumulator on a 68 HC 11

Pulse Accumulator on a 68 HC 11

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 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

Timing Interrupt Service Routines Traffic Lights Using Real-time Interrupt

Copy TRAFFIC. WHP to TRAFFIC 2. WHP

Copy TRAFFIC. WHP to TRAFFIC 2. WHP

Add: Load TRAFFIC 2. WHP TEST. SETUP TEST

Add: Load TRAFFIC 2. WHP TEST. SETUP TEST

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 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

A Circular Queue empty Containing 2 values

Timers • • The 68 HC 12 Programmable Timer Output Compares Input Capture Pulse

Timers • • The 68 HC 12 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

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

Pulse Train

Timers (cont. ) • Pulse Train Using Interrupts • Measuring the Period of a

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

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

Polaroid Ultrasonic Ranging System

Waveforms of Ultrasonic Ranging System

Waveforms of Ultrasonic Ranging System

Exercises

Exercises

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