User`s guide

Walk-Through and Detailed Tutorial

3.4 CREATING SOURCE CODE WITH THE EDITOR

Select File>New to open an empty editor window in which to type your source code. To

save your work, select File>Save

For more on the editor, see Chapter 15. “Using the Editor”.

Tutorial Step 3:

Create/locate a folder (directory), using Windows Explorer, where you will place

application project files. Then, type the following code into an MPLAB IDE editor win-

dow, or cut and paste from here. Save the file as cnt8722.asm to the project folder

when complete.

title “PIC18F8722 Counting Program”

#include <p18f8722.inc>

udata 0x60 ;declare COUNT variable

COUNT res 1 ; in bank 1

RST code 00h ;reset vector

goto Start

PGM code ;program vector

Start clrf WREG ;clear W register

movwf PORTC ;clear PORTC

movwf TRISC ;config PORTC as outputs

Init

clrf COUNT ;clear COUNT

IncCount

incf COUNT,F ;increment COUNT

movf COUNT,W

movwf PORTC ;display on Port C

goto IncCount ;loop

end

For more information on the assembly instructions, see the “PIC18F8722 Family Data

Sheet” (DS39646), Instruction Set. For more information on MPASM assembler direc-

tives and expressions, see the “MPASM™ Assembler, MPLINK™ Object Linker,

MPLIB™ Object Librarian User’s Guide” (DS33014) or MPASM assembler on-line help

in MPLAB IDE.

3.5 CREATING A NEW PROJECT

A project contains the source files needed to build and test an application. A project

configuration (workspace) includes the following: processor and display information,

such as the nature, size and position of all open windows, toolbars, execution and

debug settings. For more on projects and workspaces, see Chapter 4. “Projects and

Workspaces”.

Project and workspace global setting may be selected on the Project and Workspace

tabs of the Settings dialog (Configure>Settings

Tutorial Step 4:

For the tutorial, keep the default setup for projects and workspaces. Most notably, this

means you will be using the one-to-one project-workspace model.