User`s guide

MPLAB

IDE

USER’S GUIDE

Chapter 6. Additional Features

6.1 INTRODUCTION

MPLAB IDE contains additional features to aid in device setup, code debugging and

general support.

• Configuration Bits

• Watch Window

• Breakpoints

• High-Level Language Support

• Microchip Help

6.2 CONFIGURATION BITS

Configuration bits can be programmed (read as ‘0’), or left unprogrammed (read as ‘1’),

to select various device configurations. Consult your device data sheet for more

information.

6.2.1 Setting in MPLAB IDE or in Code

Configuration bits may be set in code (i.e., using the __config/config command or

init code) or using the Configuration Bits window (Configure>Configuration Bits

Although you can use both methods, you probably should chose one to avoid confusion

and overwriting of bit values.

If you want to change Configuration bit values in the window, do not enter any in code

until you have completed development. Then put your window values into code, rebuild

the project (which will then enter the code values into the window) and perform a final

run to make sure all is correct.

If you want to change Configuration bit values in code, do not make changes to the

window. Every time you build, the code values will be loaded into the window and you

will lose any changes you have made in the window.

6.2.2 Saving/Clearing Values

Configuration bit window values are saved/restored on close/open of the workspace.

If “Clear program memory upon loading a program” is checked in the Settings dialog

(Configure>Settings

), Program Loading tab, Configuration bits are cleared upon

loading a program (i.e., build, import or open a project).

6.2.3 Setting the Watchdog Timer

By default, the watchdog timer (WDT) is enabled on most devices. This could interfere

with program execution. You may wish to disable the WDT unless you know you will be

using it in your program.

The WDT pre/postscaler is set in the Configuration bits as well.