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EEM functionality in G2744

Jianyi Bao
Expert 2220 points

    According to SLAU144J (MSP430x2xx Family User's Guide), this series of MSP430 have some advanced EEM functionality, such as break points on CPU register, but it depends on the specific chip type. However, I can't find much information about EEM in SLAS892B (MSP430G2x44 Mixed Signal Microcontrollers).

   Actually currently I would like to know the maximum required stack size. It could be found using break points on CPU register (SP), but it seems it is not supported in G2744, as I can't select it in CCS6.

   Please tell me if break points on register is supported in G2744, and where I can find more information.

   Thanks a lot.

  • 0
    Guru 227245 points

    MSP digital inputs are high-impedance CMOS gate inputs, which are high-impedance (virtually unlimited). The datasheet specifies a maximum leakage current of 50nA. So the effective impedance is in the MOhm range.
    For analog inputs, things are different. For ADC12 or ADC10 inputs, you have an input capacitor that is charged at the begin of every conversion, so you have a dynamically changing input impedance, depending of sampling frequency and duration of the sample phase. The SD24 inputs have a capacitive input impedance with some series resistance (the channel switch =~1k). Those MSPs with buffered SD16/SD24 inputs behave similarly to the digital input pins (high-impedance inputs).

  • 0
    Guru 227245 points

    Unless you want to write your own JTAG programmer or debugger, you don’t really need this info at all. It is sufficient that your FET and your debugger know and present you the available options. The EEM is nothing you can program by the CPU.

    However, if you want to know your maximum stack usage, you can fill all ram with a guard value at program start, and after a program run, inspect how far this guard value has been overwritten by the stack.

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