Timing Diagram [8085 Microprocessor]

Timing Diagram of 8085 Microprocessor.

The graphical representation of fetch, decode, and execute operation is known as the Timing Diagram. The necessary steps which are carried in a machine cycle can represented graphically through Timing Diagram.

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Related Terms:

• Instruction Cycle: The time taken to complete the execution of an instruction is called instruction cycle. It is the combinations of machine cycles.
• Machine Cycle: The time taken by the processor to access memory location, IO ports or to acknowledge an interrupt once is called as machine cycles. It is the combinations of T-states. 
• T-States:  It is the sub-division of operation performed in one clock cycle of processor’s clock. These sub operations are internal states synchronized with processor clock.

Status Signal for various Machine Cycles in 8085 Microprocessor:

Machine Cycles	Status Signals
	IO/M	S1	S0
Opcode Fetch	0	1	1
Memory Read	0	1	0
Memory Write	0	0	1
IO Read	1	1	0
IO write	1	0	1

• The essential component of every instruction is Fetch Cycle. In Fetch cycle, CPU obtains the instruction from the Memory. 
• Once the instruction is fetched from the memory, then it is decoded by the Decoders. Decoding is the process to identify which operation is to be performed. 
• Finally the instruction is executed and this is known as the Execution cycle which consists of several operations like calculation address of operand, fetching them, performing operation on them and finally store the result in the given location.

Timing Diagrams Of 8085 are:

1. Opcode Fetch Machine Cycle
2. Memory Read Machine Cycle
3. Memory Write Machine Cycle
4. I/O Read Machine Cycle
5. I/O Write Machine Cycle

Read Also:

Instruction and Instruction Format in 8085

A. Opcode Fetch Machine Cycle(4 T-States):

B. Memory Read Machine Cycle(3 T-States):

C. Memory Write Machine Cycle(3 T-States):

D. I/O Read Machine Cycle(3 T-States):

E. I/O Write Machine Cycle(3 T-States):

So these are the Timing Diagrams in 8085 Microprocessor.

Related Posts: 

• 8085 Microprocessor Features, Pin Diagram, Architecture
• 8086 Microprocessor Features, Architecture
• All 8085 Instructions with Operand, Size, Addressing Mode, Machine Cycle, T-States
• Timing Diagram [8085 Microprocessor]