Why Are PIC Ports Configured as Inputs on Startup?

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PIC ports are configured as inputs on startup to prevent potential damage to the microcontroller and connected components. This default setting ensures that the pins do not drive external circuits, which could lead to short circuits or other failures. When a pin is configured as an output while connected to a voltage source, it could cause excessive current flow, risking damage to the microcontroller. The input configuration allows for safe monitoring of external signals, such as power supply status, without risking harm. Overall, this design choice enhances the reliability and longevity of the microcontroller in various applications.
android5555
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1. What is the default I/O configuration of all PIC ports at program computer system start-up? Why are microcontrollers designed with this standard default configuration?


3. I think all the ports are set to input to start with and then changed accordingly.
 
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You are correct, but haven't answered the second part of the question. Why are they designed that way?

As this is in the homework section you should have a go at it first.
 
I cannot find the answer anywhere. If I knew the second part of this question I would not have even posted it.
 
Lets say you were using one of the port pins to monitor the status of a 5V power supply rail or battery. eg I've got one of the port pins connected directly to this 5V power supply. Consider what happens if the pic powers up with that pin configured as an output?
 

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