Microchip PIC24FJ256GA702 Handleiding

Microchip Niet gecategoriseerd PIC24FJ256GA702

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© 2009 Microchip Technology Inc. DS01146B
Compiled Tips ‘N Tricks Guide
DS01146B-page ii © 2009 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEE EELOQ, K LOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Hampshire, Linear Active Thermistor, MXDEV,
MXLAB, SEEVAL, SmartSensor and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,
PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select
Mode, Total Endurance, TSHARC, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2009, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are co ng the code protection features ofmmitted to continuously improvi our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ ®
code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2009 Microchip Technology Inc. Page i-DS01146B
8-pin Flash PIC
®
Microcontroller Tips ‘n Tricks
Tips ‘n Tricks
TABLE OF CONTENTS
8-pin Flash PIC® Microcontrollers
Tips ‘n Tricks
TIPS ‘N TRICKS WITH HARDWARE
TIP #1: Dual Speed RC Oscillator .......................... 1-2
TIP #2: Input/Output Multiplexing............................ 1-2
TIP #3: Read Three States From One Pin .............. 1-3
TIP #4: Reading DIP Switches ................................ 1-3
TIP #5: Scanning Many Keys With One Input......... 1-4
TIP #6: Scanning Many Keys and Wake-up
From Sleep ................................................. 1-4
TIP #7: 8x8 Keyboard with 1 Input .......................... 1-5
TIP #8: One Pin Power/Data................................... 1-5
TIP #9: Decode Keys and ID Settings .................... 1-6
TIP #10: Generating High Voltages .......................... 1-6
TIP #11: V Self Starting Circuit ............................. 1-7dd
TIP #12: Using PIC
®
MCU A/D For Smart
Current Limiter............................................ 1-7
TIP #13: Reading A Sensor With Higher Accuracy ... 1-8
TIP #13.1: Reading A Sensor With Higher
Accuracy – RC Timing Method ................... 1-8
TIP #13.2: Reading A Sensor With Higher
Accuracy – Charge Balancing Method .......1-10
TIP #13.3: Reading A Sensor With Higher
Accuracy – A/D Method ..............................1-11
TIP #14: Delta Sigma Converter ...............................1-11
TIPS ‘N TRICKS WITH SOFTWARE
TIP #15: Delay Techniques .......................................1-12
TIP #16: Optimizing Destinations..............................1-13
TIP #17: Conditional Bit Set/Clear ............................1-13
TIP #18: Swap File Register with W .........................1-14
TIP #19: Bit Shifting Using Carry Bit .........................1-14
PIC® Microcontroller Low Power
Tips ‘n Tricks
GENERAL LOW POWER TIPS ‘N TRICKS
TIP #1 Switching Off External Circuits/
Duty Cycle .................................................. 2-2
TIP #2 Power Budgeting ........................................ 2-3
TIP #3 Conguring Port Pins ................................. 2-4
TIP #4 Use High-Value Pull-Up Resistors .............. 2-4
TIP #5 Reduce Operating Voltage ......................... 2-4
TIP #6 Use an External Source for
CPU Core Voltage ...................................... 2-5
TIP #7 Battery Backup for PIC MCUs ................... 2-6
DYNAMIC OPERATION TIPS ‘N TRICKS
TIP #8 Enhanced PIC16 Mid-Range Core ............. 2-6
TIP #9 Two-Speed Start-Up ................................... 2-7
TIP #10 Clock Switching .......................................... 2-7
TIP #11 Use Internal RC Oscillators ........................ 2-7
TIP #12 Internal Oscillator Calibration ..................... 2-8
TIP #13 Idle and Doze Modes ................................. 2-8
TIP #14 Use and Idle Mode .............................. 2-9NOP
TIP #15 Peripheral Module Disable
(PMD) Bits .................................................. 2-9
STATIC POWER REDUCTION TIPS ‘N TRICKS
TIP #16 Deep Sleep Mode.......................................2-10
TIP #17 Extended WDT and Deep
Sleep WDT .................................................2-10
TIP #18 Low Power Timer1 Oscillator and RTCC ....2-10
TIP #19 Low Power Timer1 Oscillator Layout ..........2-11
TIP #20 Use LVD to Detect Low Battery ..................2-11
TIP #21 Use Peripheral FIFO and DMA...................2-11
TIP #22 Ultra Low-Power
Wake-Up Peripheral ...................................2-12
PIC® Microcontroller CCP and ECCP
Tips ‘n Tricks
CAPTURE TIPS ‘N TRICKS
TIP #1: Measuring the Period of a Square Wave ... 3-3
TIP #2: Measuring the Period of a
Square Wave with Averaging ..................... 3-3
TIP #3: Measuring Pulse Width .............................. 3-4
TIP #4: Measuring Duty Cycle ................................ 3-4
TIP #5: Measuring RPM Using an Encoder ............ 3-5
TIP #6: Measuring the Period of an Analog Signal 3-6 .
COMPARE TIPS ‘N TRICKS
TIP #7: Periodic Interrupts ...................................... 3-8
TIP #8: Modulation Formats.................................... 3-9
TIP #9: Generating the Time Tick for a RTOS ........3-10
TIP #10: 16-Bit Resolution PWM ..............................3-10
TIP #11: Sequential ADC Reader .............................3-11
TIP #12: Repetitive Phase Shifted Sampling ............3-12
PWM TIPS ‘N TRICKS
TIP #13: Deciding on PWM Frequency.....................3-14
TIP #14: Unidirectional Brushed DC
Motor Control Using CCP ...........................3-14
TIP #15: Bidirectional Brushed DC
Motor Control Using ECCP ........................3-15
TIP #16: Generating an Analog Output .....................3-16
TIP #17: Boost Power Supply ...................................3-17
TIP #18: Varying LED Intensity .................................3-18
TIP #19: Generating X-10 Carrier Frequency ...........3-18
COMBINATION CAPTURE AND COMPARE TIPS
TIP #20: RS-232 Auto-baud ......................................3-19
TIP #21: Dual-Slope Analog-to-Digital Converter .....3-21

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC24FJ256GA702

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