Firmware programming in controller

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dharithothi

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Hello Guys,

This question I had from few past days. While we program any controller we write codes and burns it in controller. How exactly that code transfers into hardware inside the controller??? If I write 1 in any GPIO pin at that time we can get some positive voltage level on controller pin. But how that 1 or 0 which is written in software makes MOSFET or any internal switching in micro controller.

I know that 1 or 0 makes some switching inside but how that software flag makes that internal hardware switching???

Thanks in advance...
 

What you write is an instruction made from a combination of binary bits stored in memory. When the instruction is selected, the bits are fed to an instruction decoder which sets a specific sequence of events in action. Those events may turn switches on or off, in the case of your GPIO pin, they clock the required state in to a flip-flop which has it's output connected to the pin.

Brian.
 
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