The TEST pin on the MSP430F1121 requires a pull-down resistor < 30Kohm
for normal operation, as mentioned in the MSP430x11x1 datasheet. When
the TEST pin is high, P1.4-P1.7 are in the JTAG mode. If the TEST pin
is left floating, noise on the TEST pin can potentially switch the pins
P1.4-P1.7 to JTAG mode.