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Module 2: The 8051 Architecture

20222m

Total bit addressable area in RAM of 8051 microcontroller is ____?
(i) 8 bytes
(ii) 4 bytes
(iii) 16 bytes
(iv) 32 bytes

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Answer: (iii) 16 bytes

Explanation: In 8051 internal RAM (00H–7FH), the region 20H–2FH (16 bytes × 8 bits = 128 bits) is bit-addressable. Bits are addressed as 00H–7FH in bit address space. Additionally, most SFRs with addresses ending in 0H or 8H are bit-addressable, but the question asks about RAM area, which is 16 bytes. Some textbooks note 16 bytes = 128 bits.

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