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PC and SP in microcontroller

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Yogeshsoft

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Why are program counter and stack pointer 16-bit registers
 

Because they are both pointers into memory space. If they were only 8-bits wide the highest address a program instruction could be placed is 255 (Decimal). With 16-bits the addressable range extends to 65535 (64K) which is far more useful.

Brian.
 

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