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Module 2: The 8051 Architecture

20242m

The Program Counter (PC) in 8051 is how many bits?
(i) 8-bit
(ii) 16-bit
(iii) 12-bit
(iv) 32-bit

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Answer: (ii) 16-bit

Explanation: The Program Counter (PC) in 8051 is a 16-bit register. It holds the address of the next instruction to be fetched. Because 8051 can address up to 64K bytes of program memory (0000H–FFFFH), PC must be 16 bits wide. It is automatically incremented after each fetch and is affected by jumps, calls, and branches.

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