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.
In this “Basic Input/output and Read/write Operation - Microprocessors” you will learn about the following topics:
- Timing Diagram of 8085
- Processor Cycle
- Opcode Fetch Machine Cycle
- Memory Read Machine Cycle
- Memory Write Machine Cycle
- Input/output Read Machine Cycle
- Input/output Write Machine Cycle
- Interrupt Acknowledge Machine Cycle
- Timing Diagram of RST Instruction
- Timing Diagram of CALL Instruction
- Bus Idle Machine Cycle
- Timing Diagram of DAD Instruction
- Comparison of Opcode Fetch (OF) and Memory Read (MR)
- Comparison of Memory Read (MR) and Memory Write (MW)
- Comparison of Memory Write (MW) and Input/output Write (IOW)
- Comparison between Memory Read (MR) and Input/output Read (IOR)
- Comparison between Input/output Read (IOR) and Input/output Write (IOW)
- Timing Diagram for Different Instructions
- MOV C, A, IN 01H, MOV R, M, OUT 03H, STA 8000H, MVI A, 32H,
- Introduction to Direct Memory Access (DMA)
- DMA Operation in 8085
==== Point to Note ====
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