MSP430FR5994: How to rectrieve data preserved on FRAM?

From a device with no power? You can't.

You could include code on the device that would communicate (UART, I2C, SPI, etc.) with some other system.

Or use JTAG/Spy-By-Wire to recover the data.

This should all be pretty obvious so I guess I really don't understand your question.

I mean when It recoveries from the power-off state. How can I retrieve data that was preserved before?

David Schultz said:

use JTAG/Spy-By-Wire to recover the data.

How can I do by Spy-By-Wire?

That is the thing you used to load the code into the MSP430 in the first place. Use it with a debugger to examine memory.

Clear. Thanks, could you provide an example of this?

I am using the msp430 GCC debugger according to the slau591 file. I still cannot make it work. 

So, do you have any examples related to the slau591 file?

Can't make what work? The 'x' command? gdb?

Yes, I cannot make it work through console gdb

Hello Gaosheng,

It has been some time since we have heard from you.  Are you able to read memory?