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MSP432P401R: Use without external oscillators | TMS alsways low | not able to verify device

Aaron Hillinger
Prodigy 120 points

Part Number: MSP432P401R

Hello everybody,

I want to use the MSP432P401R without external oscillators. Therefore I left pin 41/42 (LFXIN and LFXOUT) unconected. The same for 85/86 (HFXOut and HFXIn). Additionally I wanted to use the internal LDO. Therefore I didn't connect VSW and VCore (12/14) as well.

When trying to check the connection it can be discovered that TMS is always 0V and therefore an error is thrown. The current consumption is roughly 11mA.

Has anybody an example without external oscillators or an idea, what might be the issue. I'm gratefull for every hint.

Thank you very much in advance.

All the best
Aaron

EDIT: VCore is 0V, therefore I suspect, that the MCU might be brocken. All other pins (AVCC1, AVCC2, DVCC1, DVCC2) have 3.3V and are decoupled accordingly.
Or has anybody an idea why VCORE might be 0V?

  • 0
    TI__Guru 71136 points

    Hi Aaron,

    For background information: are you using an RTOS?  If so, which one?, If not, are you configuring the GPIO and clock system using driverlib or direct register access?

  • 0 in reply to Dennis Lehman
    Prodigy 120 points

    So far I'm just trying to establish a connection via JTAG. I haven't configured the MCU beforehand. I just finished the board and wanted to test the connection. Do I have to program the MCU externally? I thought that all the registers are in default values using the internal Clock / LDO.

  • +1
    Prodigy 120 points

    EDIT: VCore is 0V, therefore I suspect, that the MCU might be brocken. All other pins (AVCC1, AVCC2, DVCC1, DVCC2) have 3.3V and are decoupled accordingly.
    Or has anybody an idea why VCORE might be 0V?

    EDIT2: I had TCK and TMS mixed up. Therefore I wasn't able to access the MCU properly.