some more practical details ...
Hi, Passion
we just had forgotten the reverse diode ( 1N400x) from regulator output to its input ...
to be fully "bullet-proof" ... ( see 78L datasheet ...)
But ... , If some LCD (or LEDs ) are used as a display ( we didn't talk about that ...) , that could make you need a 7805 instead of the 78L05 ( in all cases will improve the 5v ref voltage stability ... see output impedance of the 78L series vs. 78 series ... )
Alain
PS: No, it's not the LCD that will draw current .... but it's backlighting !!!
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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