PyQdeck LogoPyQdeckSubjectsSyllabusBlog
Back to the 2023 paper

Module 2: The 8051 Architecture

20237m

Describe the memory organization in 8051 microcontroller.

Search GoogleAsk AI
Worked SolutionAI Assisted

Memory Organization in 8051

Separate Harvard spaces: Program (64K, \overline{PSEN}) and Data (64K, \overline{RD}/\overline{WR}), plus Internal Data.

Internal Data (256B):

  • 00H-1FH: 4 register banks (R0-R7) selectable by RS1,RS0 in PSW.
  • 20H-2FH: 16 bytes bit-addressable (128 bits).
  • 30H-7FH: General purpose RAM.
  • 80H-FFH: SFRs (only direct addressing; 80H,88H...F0H bit-addressable).

External: Up to 64K program ROM (via \overline{PSEN}+ALE latch) and 64K data RAM (MOVX). \overline{EA}=0 forces external program from 0000H; =1 uses internal 0000-0FFFH then external beyond.

Access: MOV for internal direct/indirect, MOVX for external data, MOVC for program table.

Similar questions

MICROPROCESSORSExplain the internal memory organization of the microcontroller 8051.20247mMICROPROCESSORSExplain the concept of memory banks and further comment on the structure of the internal RAM of 8051.20217mMICROPROCESSORSExplain memory interfacing techniques in the 8051 microcontroller.20257mMICROPROCESSORSDraw and explain the internal block diagram of the 8051 microcontroller.20257m
PreviousWhat are the different instruction types supported in 8085 microprocessor? Explain with suitable instruction examples.NextExplain the functions of SP and PC registers in 8051 microcontroller.
AI LearningWeb Platform

Coursify — Personal AI Course Generator

Struggling with a difficult subject or concept? Turn any engineering topic into a structured course with interactive lessons, quizzes, and research-backed explanations.

Try Coursify Free