In PIC, the port pins that have internal pull up resistors are typically used as Select one:a. inputs as it helps to ensure the known state when no other circuit is connectedb. Both input as well as outputc. outputd. None of these

The correct answer is a. inputs as it helps to ensure the known state when no other circuit is connected.

Here's why:

In a PIC microcontroller, the port pins that have internal pull-up resistors are typically used as inputs. This is because the pull-up resistors help to ensure that the pins have a known state when no other circuit is connected.

When a pin is configured as an input and it's left floating (i.e., not connected to anything), it can randomly switch between high (1) and low (0) states due to electrical noise. This can cause unpredictable behavior in the system.

To prevent this, a pull-up resistor is connected to the pin. This ensures that the pin is always in a known state (high, or 1) when no other circuit is connected. When another circuit is connected, it can pull the pin low (0) as needed.

So, the pull-up resistors are very useful for input pins, but not necessary for output pins. Therefore, the port pins with internal pull-up resistors are typically used as inputs.