Contents from an IO device are read during IO read machine cycle (IORMC). This machine cycle spans three T states and is similar to MRMC except for the IO/M signal. The destination of this read operation is the accumulator. The Program Counter is not incremented here. IO/M goes high instead of going low, indicating that the microprocessor is talking to an IO device.

Basic Input/output and Read/write Operation - Microprocessors

In this “Basic Input/output and Read/write Operation - Microprocessors” you will learn about the following topics:

  1. Timing Diagram of 8085
  2. Processor Cycle
  3. Opcode Fetch Machine Cycle
  4. Memory Read Machine Cycle
  5. Memory Write Machine Cycle
  6. Input/output Read Machine Cycle
  7. Input/output Write Machine Cycle
  8. Interrupt Acknowledge Machine Cycle
  9. Timing Diagram of RST Instruction
  10. Timing Diagram of CALL Instruction
  11. Bus Idle Machine Cycle
  12. Timing Diagram of DAD Instruction
  13. Comparison of Opcode Fetch (OF) and Memory Read (MR)
  14. Comparison of Memory Read (MR) and Memory Write (MW)
  15. Comparison of Memory Write (MW) and Input/output Write (IOW)
  16. Comparison between Memory Read (MR) and Input/output Read (IOR)
  17. Comparison between Input/output Read (IOR) and Input/output Write (IOW)
  18. Timing Diagram for Different Instructions
  19. MOV C, A, IN 01H, MOV R, M, OUT 03H, STA 8000H, MVI A, 32H,
  20. Introduction to Direct Memory Access (DMA)
  21. DMA Operation in 8085





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BCA 3rd Semester Microprocessors Notes Pdf: