Hi,
I've found a problem on my PCB which uses a MSP430F5438.
I'm testing it in a fridge which creates big EMI radiations when the motor is turned off.
These EMI create glitches on the TEST/SBWTCK which is connected to a ~5cm open wire.
These glitches seems to put the MCU in SPY-bi-wire mode and put the RST/NMI/SBWTDIO pin down during ~40uS.
Then the MCU does a reset because the voltage on the RST pin is too low.
As recommended, I have a 47k pull-up and a 2.2nF condensator on the RST pin.
I've found that putting a 1k pull-down resistor on the TEST/SBWTCK solves the problem.
The datasheet says that I should leave the TEST/SBWTCK open.
Will I have troubles with the programming tools (MSP-FET or others) if I put this 1k pull-down ? (it seems to work with MSP-FETU430IF)
Or is there an other way to solve this issue ?