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Operaon

User Guide

DS-50003529B - 44

Figure 4-5. Improper Circuit Components

In particular, these guidelines must be followed:

• Do not use pull-ups on PGC/PGD – they could disrupt the voltage levels.

• Do not use capacitors on PGC/PGD – they will prevent fast transitions on data and clock lines

during programming and debugging communications, and slow programming times.

• Do not use capacitors on

MCLR – they will prevent fast transitions of VPP. A simple pull-up

resistor is generally sucient.

• Do not use diodes on PGC/PGD – they will prevent bidirectional communication between the

debugger and the target device.

4.4.2.2 Sequence of Operaons Leading to Debugging

Given that the 4.4.2.4. Requirements for Debugging are met, set the MPLAB ICD 5 In-Circuit

Debugger as the current tool in MPLAB X IDE. Go to File> Project Properties to open the dialog and

then under “Hardware Tool,” click “ICD 5.”

The following actions can now be performed:

• When Debug > Debug Main Project is selected, the application code is programmed into the

device’s memory via the ICSP protocol as described at the beginning of this section.

• A small “debug executive” program is loaded into the memory of the target device. Since some

architectures require that a 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 X IDE. These allow

the debug executive to be activated by the debugger. For more information on the device’s

reserved resources, see 4.4.2.5. Resources Used by the Debugger.

• The target device is run in Debug mode.

4.4.2.3 Debugging Details

The gure below illustrates the MPLAB ICD 5 In-Circuit Debugger system when it is ready to begin

debugging. In the gure, Rpu=10 kΩ typical and Ric=4.7 kΩ.

Note: There are programmable pullups and pulldowns instead of xed resistor.

Microchip Technology MPLAB ICD 5 User Manual

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