3.2.3.2 Externally Powered Through Debugger

An alternative method of powering the target device is an external power supply connected directly to the MPLAB ICD 4. Be aware that you must also select power from the MPLAB ICD 4 debugger via MPLAB X IDE.

Not all devices have the AV_DD and AV_SS lines, but if they are present on the target device, all must be connected to the appropriate levels in order for the debugger to operate. They cannot be left floating.

In general, it is recommended that all V_DD/AV_DD and V_SS/AV_SS lines be connected to the appropriate levels. Also, devices with a V_CAP line (PIC18FXXJ MCUs, for example) should be connected to the appropriate capacitor or level.

Note: The interconnection is very simple. Any problems experienced are often caused by other connections or components on these critical lines that interfere with the operation of the MPLAB ICD 4 In-Circuit Debugger system, as discussed in the following section.