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MSP430 Port 1 and MSP-FETUIF not playing nice

Brad Tompkins
Prodigy 20 points

I've looked in the forums and I am unable to find the answer I'm looking for.  The top 4 bits (4,5,6,7) of port 1 do not work properly when the FET is hooked to it.  If I disconnect and restart the controller all is well.  Unfortunately this does not allow me to do any debugging.  Please offer suggestions.

I have stripped the code down to the bare minimum.  I have tried three different microcontrollers with the exact same problem.  I've tried programming out of the circuit, providing power thru the FET and leaving my controller in the circuit.  Same results.

The following are the microcontrollers I have tried are f1232, f2131 and f1121a.

  • 0
    Guru 58965 points

    Read the pin out list of the chips. Those four port pins are also used as JTAG pins. This means you cannot use them as port pins when the FET tool is controlling the JTAG signals. You need to switch to chips with dedicated JTAG pins such as F13x, F14x, F24c, etc. or chips with SBW such as F20x, G2xx.

    (SBW is another version of JTAG which share the RST and TEST pins of the chips.)

  • 0 in reply to old_cow_yellow
    Prodigy 20 points

    Yikes.  I see it on the datasheets!  Now I feel foolish. 

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