3.3.4.1 JTAG Physical Interface

The JTAG interface consists of a four-wire Test Access Port (TAP) controller that is compliant with the IEEE® 1149.1 standard. The IEEE standard was developed to provide an industry-standard way to efficiently test circuit board connectivity (Boundary Scan). Microchip AVR and SAM devices have extended this functionality to include full Programming and On-chip Debugging support.

To use this target interface with MPLAB X IDE, open the Project Properties window, ICE 4 category, Communications option category, and select either 2-wire JTAG or 4-wire JTAG. See 9.2 Emulator Options Selection.