The MSP family supports the standard JTAG interface, which requires four signals for sending and receiving data. The JTAG signals are shared with general-purpose I/Os. The TEST/SBWTCK pin is used to enable the connection of external development tools with the device through Spy-Bi-Wire or JTAG debug protocols. The connection is usually enabled when the TEST/SBWTCK is high. When the connection is enabled, the device enters a debug mode. In the debug mode, the times for entry to and wake up from low-power modes may be different compared to normal operation. Pay careful attention to the real-time behavior when using low-power modes with the device connected to a development tool.
Section 220.127.116.11 lists the JTAG and Spy-Bi-Wire interface characteristics.