MSP430FR6989: Interaction MSP430FR6989 without passcode

Young Hu

Part Number: MSP430FR6989
Other Parts Discussed in Thread: MSP-GANG,

Hi Champs,

My customer is using MSP430FR6989 in their ultrasonic water meter. The device was locked using MSP-GANG, and don't know the passcode. Some of MCU was found to hang up in the field. They want to know in this situation, is it possible to interact with the device via JTAG/UART? For example, if MCU was jumped into JTAG mode by accident, is it possible that we send a command to access JTAG module to check whether CPU can response? Or even blocked and get blocking information?

Thanks.

BR,

Young

over 8 years ago

0 Ryan Brown1 over 8 years ago

TI__Guru**** 219597 points

Hi Young,

If the customer knows the memory contents of 0xFFE0 to 0xFFFF (interrupt vectors/BSL password) and has access to the BSL pins (P2.0 transmit & P2.1 receive) then they can access the device through the BSL to recover the JTAG password and unlock the JTAG interface. Please review the BSL User's Guide (SLAU550) and BSL Scripter (SLAU655):

http://www.ti.com/lit/ug/slau550e/slau550e.pdf

http://www.tij.co.jp/jp/lit/ug/slau655b/slau655b.pdf

Giving a wrong BSL password will initiate a mass erase, at this point you will not be able to evaluate the failure but you will at least recover access to the device JTAG.

Regards,
Ryan

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MSP430FR6989: Interaction MSP430FR6989 without passcode