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    This is mostly true for a kernel-like freestanding system. You don't have direct access to IO or interrupts or hardware timer when coding user code to be run under some operating system. Commented Jun 27, 2015 at 5:25
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    I'm tempted to downvote that answer, because it does not answer the question; it looks like the OP want to code under some operating system (not on the bare metal), and then the above answer is off-topic. Commented Jun 27, 2015 at 5:44