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Module 2: The 8051 Architecture

20202m

Which register usually stores the output generated by ALU in several arithmetic and logical operations?
(i) Accumulator
(ii) Special function register
(iii) Timer register
(iv) Stack pointer

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Answer: (i) Accumulator

Explanation: Accumulator (ACC, A register, address E0H) is the primary working register for ALU in 8051 and 8085. Most arithmetic-logic operations take one operand from A and store result back into A. SFR, Timer, SP do not hold ALU results.

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