This has nothing to do with bit variables.

When you run a program on a computer system like a PC, it runs, it finishes, then it returns to the operating system (DOS, UNIX, Windoze, whatever).

On an embedded system like yours, there is no operating system; there is nothing to return to.
So, unless you specifically do something to stop it, the processor will just continue incrementing the Program Counter, fetching bytes from the CODE memory, and executing them as instructions. Eventually, it will reach the end of the CODE memory, and the next Program Counter increment will bring it right back to address 0000 - which is where it started in the first place!
And so on, ad infinitum.

Typically, an embedded system just keeps performing its function the whole time that it is switched on - so its main() function looks something like this:

void main( void )
{
   // do initialisation stuff
   :
   :

   for( ;; ) // infinite loop
   {
      // do regular stuff
      :
      :
   }
}

Some people like to call this a "Super Loop" - but that seems to me to imply that it's something special, when it isn't.

If you really want a "one-shot" system - ie, does something, then stops - its main() function would look something like this:

void main( void )
{
   // do initialisation stuff
   :
   :

   // do one-off stuff

   for( ;; ) ; // infinite loop - "hang" here
}

Rather than an infinite loop at the end, you might put the processor into some powerdown or idle mode that can only be exited by a Reset...


For an infinite loop, note that

   for( ;; );

is equivalent to

   while( 1 );