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Module 2: The 8051 Architecture

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Write short notes on: Stack & Stack Pointer

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Short Notes: Stack & Stack Pointer

  • Stack: LIFO area in internal RAM (default 08H upward), holds return addresses, register context, data via PUSH/POP.
  • SP (81H): Points to top. Reset 07H. PUSH → SP++ then store; POP → load then SP--. Relocate: MOV SP,#60H to avoid overlap with register banks/bit area. Depth limited by RAM (max 128-7FH). Overflow collides SFRs.

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