I am designing an embedded product based on the TMS430F20x2.
I am using port P1.4 to toggle an external flip/flop that powers down my system. The control signal is asserted low.
We need to ensure that the microprocessor's port behavior during power up and also coming out from sleep will not accidentally power off my system.
I plan to use the internal port's pull-up resistor, and to configure port P1.4 as an output.
The microprocessor's pin voltage must absolutely stay high all the time, including power up and coming out from sleep, and only drop to zero upon explicit command to avoid unintended system power off.
Can someone give me advice on how I can ensure this without using an external pull-up resistor?
Thanks