Ага, нашел. MSP430(tm) Hardware Tools User's Guide (Rev. H) - slau278h.pdf, стр.26, примечание (Note B) к рисунку 2-2. http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=SLAU278&fileType=pdf
B The device RST/NMI/SBWTDIO pin is used in 2-wire mode for bidirectional communication with the device during JTAG access and that any capacitance attached to this signal may affect the ability to establish a connection with the device. The upper limit for C1 is 2.2nF when using current TI FET interface modules (USB FET).
См. аналогичное по смыслу предупреждение (Note E) ниже рисунка Figure 2-1.