Delay/Disable Output Pin On Power On Using Electronics
An RC Delay and an AND transistor arrangement did the trick.

R1 and C1 take about 2 seconds to reach 2V; at this point, the current is enough through R2 to turn Q1 on. It stays like this as long as power is applied.

Then the OR gate can function as it should.

Now, when power is first applied and the uC tries to send a pulse down one of the OR gate pins, nothing happens because Q1 hasn't yet turned on.







simulate this circuit &ndash; Schematic created using CircuitLab