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Why are program counter and stack pointer 16-bit registers?
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Answer Posted / venki
8 bit address can only locate/address 256 memory locations. 16 bit address can locate up to 64kb. Even if 8 bit system can have more than 256 bytes of Ram/Rom/Flash (say whatever). And hence the need of 16 bit PC & SP instead of 8 bits. Data registers or data bus could be just 8 bits still.
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