[Verse 1] Microcontrollers speak through special addresses Hardware secrets hidden in numbered confesses Each peripheral claims its slice of space GPIO ports at base two-thousand-eight [Chorus] Memory mapped, memory mapped Registers waiting where the bits are trapped Write the value, read the state Hardware dancing through the memory gate Memory mapped, memory mapped Control the world through addresses snapped [Verse 2] Pin direction register sets the flow Input mode or output mode, watch it glow Bit manipulation with shifting masks Set and clear, the silicon asks [Chorus] Memory mapped, memory mapped Registers waiting where the bits are trapped Write the value, read the state Hardware dancing through the memory gate Memory mapped, memory mapped Control the world through addresses snapped [Verse 3] Timer control at offset forty-two PWM frequency, what will you do? Interrupt enable bits aligned in rows Status flags tell you what the hardware knows [Bridge] Volatile keyword protects the read Compiler optimization, watch where you tread Memory barriers keep the order straight Atomic operations seal the fate [Chorus] Memory mapped, memory mapped Registers waiting where the bits are trapped Write the value, read the state Hardware dancing through the memory gate Memory mapped, memory mapped Control the world through addresses snapped [Outro] Direct control through silicon veins Memory mapped magic, the engineer reigns
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