7.4 Connecting External Debuggers

Even though there is an on-board debugger, external debuggers can be connected directly to the PIC18F47K42 Curiosity Nano to program/debug the PIC18F47K42. The on-board debugger keeps all the pins connected to the PIC18F47K42 and board edge in tri-state when not actively used. Therefore, the on-board debugger will not interfere with any external debug tools.

Figure 7-5. Connecting the MPLAB PICkit™ 4 In-Circuit Debugger/Programmer to PIC18F47K42 Curiosity Nano

CAUTION: The MPLAB PICkit 4 In-circuit Debugger/Programmer is capable of delivering high voltage on the MCLR pin. R110 can be permanently damaged by the high voltage. If R110 is broken, the on-board debugger can not enter programming mode of the PIC18F47K42, and will typically fail at reading the device ID.

CAUTION: To avoid contention between the external debugger and the on-board debugger, do not start any programming/debug operation with the on-board debugger through Microchip MPLAB® X or mass storage programming while the external tool is active.