MPLAB ICD 3 In-Circuit Debugger User's Guide

MPLAB ® ICD 3 In-Circuit Debugger User’s Guide5.10 RUNNING DEBUG CODEThe MPLAB ICD 3 in-circuit debugger executes in Real Time or in Step mode.• Real Time execution occurs when the device is put in the MPLAB IDE’s Runmode.• Step mode execution can be accessed after the processor is halted.These toolbar buttons can be used for quick access to commonly-used debugoperations.DebuggerMenuToolbarButtonsBegin in Real-Time mode:1. Open the source files counter.c and timer.c (double click on the file namesin the Project window or use File>Open).2. Select Debugger>Run (or click the Run toolbar button).3. Observe the LEDs. They will be counting up in binary.4. Select Debugger>Halt (or click the Halt toolbar button) to stop the programexecution.5. When the debugger halts, one of the open source code windows will pop to thefront and a green arrow will indicate where the program halted.To use Step mode:1. Select Debugger>Step Into (or click the Step Into toolbar button) to execute oneinstruction and then halt. The green arrow in the code listing will moveaccordingly.2. Repeat as needed.The step functions “Step Over” and “Step Out” are used with functions and discussedin the MPLAB IDE documentation.5.11 DEBUGGING CODE USING BREAKPOINTSRun Halt Animate Step Into Step Over Step Out ResetThe example code in this tutorial has already been debugged and works as expected.However, this code is still useful to demonstrate the debugging features of the MPLABICD 3 in-circuit debugger. The first debug feature to be discussed are breakpoints.Breakpoints stop code execution at a selected line of code.• Setting Software Breakpoints5.11.1 Choosing a Breakpoint TypeFor the device used in this tutorial, you have the choice of using either hardware orsoftware breakpoints.To set breakpoint options, select Debugger>Settings and click on the Configurationtab. Select the type of breakpoint that best suits your application needs. For this tutorial,we will begin using the default breakpoint type (hardware breakpoints.)DS51766A-page 40© 2008 Microchip Technology Inc.