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Module 2: The 8051 Architecture

20242m

The default start value of Stack Pointer after reset in 8051 is:
(i) 00H
(ii) 10H
(iii) FFH
(iv) 07H

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Answer: (iv) 07H

Explanation: After reset, SP = 07H in 8051. Therefore the first PUSH increments SP to 08H (first stack location, which is also the start of the user RAM above register banks 0-3). Many textbooks initialise SP to 60H to avoid overlap, but default reset value is 07H.

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