SLAZ509AC January 2013 – May 2021 MSP430F67691
PORT Module
Functional
Incorrect values for P1.1 / P1.2 input pins during power-up
If P1.1/P1.2 is pulled up externally to DVCC during power-up the logical HIGH value might not be read correct by the device (ZERO is read instead of ONE).
1) Switch the P1.1/P1.2 Port to logical ZERO after power cycle by:
a) Switch critical GPIO to output-low (with series resistance to limit current) or
b) Remove external pull up connection to pull GPIO via internal pull-down
OR
2) Use different GPIOs (not P1.1 & P1.2)
OR
3) Change the polarity of the logical check in SW (enable internal pull-up resistor for the GPIO and pull the external pin to DVSS)