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MSP430G2553: After debugging, when the power is turned on again, the microcontroller does not run.

Part Number: MSP430G2553
Other Parts Discussed in Thread: MSP-EXP430G2ET

Dear Experts.

I'm developing a board using the MSP430G2553(DIP20pins).
I'm in trouble.

The MSP430G2553(DIP20pins) is mounted on a board under development.
* Connect 10V/22uF and 16V/0.1uF between the 3.3V power terminal (#1) and the GND terminal (#20).
* The reset terminal (#16) is pulled up at 47k-ohm and grounded at 16V/1000pF.
* And the TEST pin (#17) is pulled up at 47k-ohm.
* Removed all other wires.

Connect at Spy-by-wire from the launchpad's 7-pin connector to the target board.
[launchpad: MSP-EXP430G2ET]---[target]
3V3--------(#1) 3.3V power
GND--------(#20) GND
SBWTDIO------(#16)/RES,SBWTDIO
SBWTCK-------(#17)TEST,SBWTCK
Power is supplied from launchpad.

1-- Build the project .....complete without error.
2-- Start Debug .....start communication to the target board.
3-- Wait for a while until the dialog disappears ......maybe writing...
4-- Click [Resume] button ....The program runs and works as intended.
6-- Click [Terminate] button.
7-- Disconnect from launchpad.
8-- When the target board is energized alone, it works as a stand-alone.

In this way, It's been working very well. 2 months ago.

I am doing the same now.
1~7 do not change behavior.
8-- Program does not run on target board alone. why?

******** The problem I'm having now is... ********
* Successful debugging from launchpad. Works fine.
* Power off. (wait a few seconds until the power is completely off.)
* Power on again.
* But the target doesn't work. <==== I'm stumbling.

I need your help.
thank you.

  • Hi Syun,

    The only thing I see wrong here is you have the TEST pin pulled up to VDD.  This pin is pulled low internally.  You may have been lucky in the past with this pin pulled high and the MSP430 works.  Try removing the resistor and see if this fixes the issue.

  • Hi Dennis,

    I know that many circuits on the net are used open.

    I was watching But I didn't understand correctly that it is pulled down internally.

    I will try using the TEST pin open.

    Thank you for your advice.

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