I'd recommend changing R146 to 47k Ohms and reduce C104 to 1.1 nF (since the upper limit for C104 is 2.2 nF and your board traces, wires, etc. could be exceeding this value as described in Note B here ). Also, as discussed above, on some Spy-Bi-Wire capable MSP430 devices, TEST/SBWTCK is very sensitive to rising signal edges that can cause the test logic to enter a state where an entry sequence (either 2-wire or 4-wire) is not recognized correctly and JTAG access stays disabled. Unintentional edges on SBWTCK can occur when the JTAG connector is connected to the target device. As a workaround, try adding an external pull-down resistor (e.g. 4.7k Ohms) at the TEST/SBWTCK pin (as discussed here ). Regards, James MSP Customer Applications
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