The MSP430 family supports the standard JTAG interface, which requires four signals for sending and receiving data. The JTAG signals are shared with general-purpose I/O. The TEST/SBWTCK pin is used to enable the JTAG signals. In addition to these signals, the RST/NMI/SBWTDIO is required to interface with MSP430 development tools and device programmers. The JTAG pin requirements are summarized in Table 6-4. For further details on interfacing to development tools and device programmers, see the MSP430 Hardware Tools User's Guide (SLAU278). For a complete description of the features of the JTAG interface and its implementation, see MSP430 Programming Via the JTAG Interface (SLAU320).
Table 6-4. JTAG Pin Requirements and Functions
| DEVICE SIGNAL | DIRECTION | FUNCTION |
| PJ.3/TCK | IN | JTAG clock input |
| PJ.2/TMS | IN | JTAG state control |
| PJ.1/TDI/TCLK | IN | JTAG data input, TCLK input |
| PJ.0/TDO | OUT | JTAG data output |
| TEST/SBWTCK | IN | Enable JTAG pins |
| RST/NMI/SBWTDIO | IN | External reset |
| VCC | | Power supply |
| VSS | | Ground supply |
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