MPLAB ICD 4 Help

Circuits That Will Prevent the Debugger From Functioning

Figure: Improper Circuit Components shows the active debugger lines with some components that will prevent the MPLAB ICD 4 In-Circuit Debugger system from functioning.

Figure: 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 sufficient.

•	Do not use diodes on PGC/PGD – they will prevent bidirectional communication between the debugger and the target device.

Microchip Support Help Updated: 2019-06-25 10:29:53Z Help Page: 12