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Module 2: The 8051 Architecture

20242m

Which type of memory in 8051 is bit-addressable?
(i) Entire RAM
(ii) Register bank
(iii) 16 bytes of internal RAM from 20H to 2FH
(iv) Entire ROM

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Answer: (iii) 16 bytes of internal RAM from 20H to 2FH

Explanation: Bit-addressable RAM in 8051 is exactly 16 bytes at 20H–2FH (128 bit addresses 00H–7FH). Certain SFRs (80H, 88H, 90H ... F0H) are also bit-addressable, but the RAM bit-addressable area is 20H–2FH. Entire RAM (00H–FFH) is not bit-addressable.

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