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MSP430FR5730: Debugging problem

Part Number: MSP430FR5730
Other Parts Discussed in Thread: MSP-FET

Hi folks,

I need your help again.

I have two boards with the MSP430FR5730 on them.

I'm using IAR EW430 v7.11.1. The effect I have was reproduced with both MSP-FET Debugger I have (the old grey and the new black)

The layout changes around the MSP430 are really small.

I have the 47k pull-up and the 2.2nF (1nF tested also) in the SBWTDIO line. Both tested in the board with a multimeter/rcl-meter OK.

The old board the debugger plus EW430 works fine.

The new board always answers with: "Fatal error. Closing debug session".

The debug log says: "Thu Feb 21, 2019 15:27:05: Could not reset device : (Reset) , method=0x1, execute=0, releaseJTAG=0 "

Funny is, that I could program this MSP430 the first time and newer again.

I connected my scope to the SBW line and this is what I see (upper 4 graphs is the new board, the lower 4 graphs the old board).

They start to differ after 500 ms:

Any idea?

Regards

Gerd

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