memory interfacing in 8085 microprocessor pdf

So, we need to interface the keyboard and other devices with the microprocessor by using latches and buffers.

From the topic of Memory Read Machine Cycle, I got an example of timing diagram for MVI instruction.

Again in another topic Memory Interfacing, the book shows timing diagram of Memory Read Cycle.

Here 8085 provides two signals IOM(bar) and RD(bar) to indicate that it is a memory read operation.

The IOM(bar) and RD(bar) can be combined to generate the MEMR(bar) (Memory Read) control signal that can be used to enable the output buffer by connecting to the memory signal RD(bar).

And the memory places the data byte from the addressed register during T2, that is read by the microprocessor before the end of T2.

Why in this diagram there is arrow from IOM to RD and from RD to MEMR Both the figure says Memory Read Cycle but there are some differences in the two timing diagrams in M2.

Please can anyone explain when to use the first one and when to use the second timing diagram.

In this chapter, we will discuss Memory Interfacing and IO Interfacing with 8085.

Interface is the path for communication between two components.

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For this, both the memory and the microprocessor requires some signals to read from and write to registers.

The interfacing process includes some key factors to match with the memory requirements and microprocessor signals.

The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor.

Memory Interfacing In 8085 Microprocessor Pdf