MPC 5606B: We are using port a1 pin in input pin but weirdly a1 pin appears to have 5v when we use sbc power. Do you know why is happens?
do you use demo board TRK-MPC5606B? If so, PA1 pin is connected to INT pin on MC33905. INT is open drain with internal pull up. The pin is active low and it is asserted when interrupt condition occurs. This could explain why you can see PA1 set to logic '1'.
PA1 itself should be in tristate during and after reset.
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