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MSP430 output pin during flash reprogramming

Clay Shoup
Intellectual 410 points

(Reflash of the MSP430 under control of our main processor.), it is imperative that one of the MSP430 outputs (P1.1) remain driven to a high state.  This pin controls power to the main processor so if we allow this pin to go low, we lose power to the main processor while it is attempting to reprogram the flash.

I haven’t looked closely at the JTAG protocol and operations during flash programming.  Would you expect any problem with maintaining P1.1 as a high output during reprogramming?

  • 0
    Guru 227245 points

    During flash programming, it may happen that the JTAG programmer triggers a reset in order to get control over the device. Since the default for the ports is high-impedance input, the pin won't go low, but if you need the driving current, I'd go for an external pullup to VCC instead and switch the pin from input to low output for shutdown.

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