文件列表:

pwm.c (4416, 2009-07-02)
PIC18_PWM.mcp (1127, 2009-07-02)
PIC18_PWM.mcw (30208, 2009-07-02)

Readme File for Code Example: PULSE WIDTH MODULATION ----------------------------------------------------------------------------------------- This file contains the following sections: 1. Code Example Description 2. Folder Contents 3. Suggested Development Resources 4. Reconfiguring the project for a different PIC18F device 5. Revision History NOTE: The example code makes use of Peripheral Library support available with MCC18. 1. Code Example Description: ---------------------------- In this code example, PWM module in PIC18F4685 is used to generate PWM signal on CCP1 pin. The period, duty cycle calculations are based on the following formulas tabulated. *Formula for Period and Duty cycle calculatio * * PWM period = [(period ) + 1] x 4 x Tosc x TMR2 prescaler * * PWM x Duty cycle = (DCx<9:0>) x Tosc * * Resolution (bits) = log(Fosc/Fpwm) / log(2) 2. Folder Contents: ------------------- This folder refers the following sub-folders: a. C:\MCC18\bin\LKR This folder will have the device LKR file, it is used for building the project. This file was provided with the MCC18 toolsuite. b. C:\MCC18\h This folder contains C header files useful in building this project. Device register and bit definitions are provided in the *.h file that follows the device name. These files were provided with the MCC18 toolsuite.The peripheral library header files contains the macro definition & API prototypes. c. C:\MCC18\lib This folder contains library archive files, which are a collection of precompiled object files. The file named "*.lib" in the name of device contains the C run-time, start-up & Peripheral library. These file were provided with the MCC18 toolsuite. d. C:\MCC18\src This folder contains all the C ,Assembler, Peripheral library source files (*.c, *.s) used in demonstrating the described example. e. C:\MCC18\doc This folder contains the Peripheral Library description for all modules. 3. Suggested Development Resources: ----------------------------------- a. MPLAB IDE with MCC18 v3.30 or above b. PIC DEM 2+ Development Board with PIC18F4685 controller 4. Reconfiguring the project for a different PIC18F device: ------------------------------------------------------------- The Project/Workspace can be easily reconfigured for any PIC18F device. Please use the following general guidelines: a. Change device selection within MPLAB?IDE to a PIC18F device of your choice by using the following menu option: MPLAB IDE>>Configure>>Select Device b. To configure the device settings, either choose from the MPLAB IDE>>Configure>>"Configuration bits" and configure for necessary settings or the corresponding configuration macros to be added into the code can be obtained from device.INC file at the following default location: "C:\MCC18\mpasm" These macros can be added as depicted in example code. c. Re-build the MPLAB?project using the menu option: MPLAB IDE>>Project>>Build All d. Download the hex file into the device and run. 5. Revision History : --------------------- 04/04/2009 - Initial Release of the Code Example

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