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Why are program counter and stack pointer 16-bit registers?

Answer Posted / abhinava

Program Counter (PC) and Stack Pointer (SP) are basically
used to hold 16-bit memory addresses.PC stores the 16-bit
memory address of the next instruction to be fetched.SP can
be used to temporarily store the 16-bit memory address as
well as data

So, PC & SP are 16-bit registers.

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