User manual

MPLAB

REAL ICE

™

In-Circuit Emulator User’s Guide

• The target device must have its configuration words programmed correctly:

- The oscillator Configuration bits should correspond to RC, XT, etc., depending

upon the target design.

- For some devices, the Watchdog Timer is enabled by default and needs to be

disabled.

- The target device must not have code protection enabled.

- The target device must not have table read protection enabled.

2.7.1 Sequence of Operations Leading to Debugging

Given that the Requirements For Debugging are met, these actions can be performed

when the MPLAB REAL ICE in-circuit emulator is set as the current debugger

(Debugger>Select Tool

• The application code is compiled/assembled with the “Build Configuration” list box

on the MPLAB IDE toolbar set to “Debug”. Also, it may be set by selecting

Project>Build Configuration>Debug

• When Debugger>Program

is selected, the application code is programmed into

the device’s memory via the ICSP protocol as described above.

• A small “debug executive” program is loaded into the high area of program

memory of the target device. Since the debug executive must reside in program

memory, the application program must not use this reserved space. Some devices

have special memory areas dedicated to the debug executive. Check your device

data sheet for details.

• Special “in-circuit debug” registers in the target device are enabled by MPLAB

IDE. These allow the debug executive to be activated by the emulator.

• The target device is held in Reset by keeping the V

PP/MCLR line low.