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TWO Questions about microcontrollers

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yasirali

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hi

All ,answer my two questions.....
which thing start executing hex file on tiny devices like microcontroller?
what all happen before main and can we execute our own code before main?
 

Microcontroller or microprocessors are made in such a way that if we give recommended power and minimum circuit its circuit will start reading code from a pre defined locations. and this location can be different for each microcontroller
like 8051 start reading first code from 0000H location. this is called op-code fetch cycle.
hope this will clear your doubt.
 
yasirali said:
hi

All ,answer my two questions.....
which thing start executing hex file on tiny devices like microcontroller?
Click to expand...

You need to have a programmer that will be used to download the code to the microcontroller. The code resides in the EPROM of controller from where it is fetched, decoded and executed by those tiny devices.... It is the way they are designed to work.

what all happen before main and can we execute our own code before main?
Click to expand...

Before the start of main(), there are some initialization, that include, Interrupt vector, Stack preparation and code for initialization of global variables... there can be other extra steps depending your microcontroller.

You can execute your own code before main(). For this change your Startup or init file. For further information, you need to see the documentation of your compiler manufacturer.
 
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