Requirements For Debugging

To debug (set breakpoints, see registers, etc.) with the MPLAB® REAL ICE™ in-circuit emulator, there are critical elements that must be working correctly.


1

Emulator-to-PC Connection

The emulator must be connected to a PC. It must be powered by the PC via the USB cable, and it must be communicating with MPLAB X IDE software via the USB cable.

2

Emulator-to-Target Connections

The emulator must be connected to the Vpp, PGC and PGD pins of the target device with the modular interface cable (or equivalent). Vss and Vdd are also required to be connected between the emulator and target device.

3

Target Power and Clock

The target device must have power and a functional, running oscillator – either internal or external. If the target device will not run (for whatever reason), the emulator cannot debug.

4

Configuration Words Set for Debug

The target device must have its Configuration words programmed correctly:

  • The oscillator Configuration bits should correspond to RC, XT, etc., depending on the target design.
  • On 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.
  • For some devices with more than one PGC/PGD pair, the correct pair needs to be configured. This is only needed for debugging since programming will work over any PGC/PGD pair.

5

Proceed to Debug

To perform and understand the debug operation, see:

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