Micrprocessor and its application

[karthikss42]

Hi i need to learn timing diagram concept.by studying through book that is not clear for me ..can anyone send simple notes to understand timing diagram with one example...

 

[eramit123456]

Timing Diagram is a graphical representation. It represents the execution time taken by each instruction in a graphical format. The execution time is represented in T-states.

Below example will help you...it consist almost all machine cycles..

Timing diagram for STA 526AH.

STA means Store Accumulator -The contents of the accumulator is stored in the specified address(526A).
The opcode of the STA instruction is said to be 32H. It is fetched from the memory 41FFH(see fig). - OF machine cycle
Then the lower order memory address is read(6A). - Memory Read Machine Cycle
Read the higher order memory address (52).- Memory Read Machine Cycle
The combination of both the addresses are considered and the content from accumulator is written in 526A. - Memory Write Machine Cycle
Assume the memory address for the instruction and let the content of accumulator is C7H. So, C7H from accumulator is now stored in 526A.

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Timing diagram for IN C0H.

Fetching the Opcode DBH from the memory 4125H.
Read the port address C0H from 4126H.
Read the content of port C0H and send it to the accumulator.
Let the content of port is 5EH


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