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Module 2: The 8051 Architecture

20252m

The Stack Pointer points to

(i) Program memory
(ii) Top of stack
(iii) Data memory
(iv) I/O port

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Answer: (ii) Top of stack

Explanation: Stack Pointer (SP) is an 8-bit register (address 81H) that holds the address of the top of stack - the last pushed byte in internal RAM. On PUSH, SP increments then stores; on POP, data retrieved then SP decrements. After reset SP=07H, so stack grows from 08H upwards.

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