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8085 Timing Diagram Guide

The document discusses the timing diagram of the 8085 microprocessor. It explains that the timing diagram graphically represents the execution time of instructions in T-states. It also defines an instruction cycle as the time to execute an instruction, a machine cycle as the time to access memory or I/O, and a T-state as a portion of an operation in one clock period. Finally, it outlines the 5 basic machine cycles of the 8085 including opcode fetch, memory read/write, I/O read/write, interrupt acknowledge, and bus idle cycles.

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Santhosh Kumar J
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355 views14 pages

8085 Timing Diagram Guide

The document discusses the timing diagram of the 8085 microprocessor. It explains that the timing diagram graphically represents the execution time of instructions in T-states. It also defines an instruction cycle as the time to execute an instruction, a machine cycle as the time to access memory or I/O, and a T-state as a portion of an operation in one clock period. Finally, it outlines the 5 basic machine cycles of the 8085 including opcode fetch, memory read/write, I/O read/write, interrupt acknowledge, and bus idle cycles.

Uploaded by

Santhosh Kumar J
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPTX, PDF, TXT or read online on Scribd
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TIMING DIAGRAM OF 8085

TIMING DIAGRAM

 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.


INSTRUCTION CYCLE, MACHINE
CYCLE AND T-STATE
 The time required to execute an instruction
is called instruction cycle.
 The time required to access the memory or
input/output devices is called machine
cycle.
 A portion of an operation carried out in one
system clock period is called as T-state
CONTROL SIGNALS
MACHINE CYCLES OF 8085

The 8085 microprocessor has 5 basic machine cycles.


They are
1. Opcode fetch cycle
2. Memory read cycle
3. Memory write cycle
4. I/O read cycle
5. I/O write cycle
6. Interrupt Acknowledge cycle
7. Bus Idle cycle
OPCODE FETCH MACHINE
CYCLE OF 8085
MEMORY READ MACHINE
CYCLE OF 8085
MEMORY WRITE MACHINE
CYCLE OF 8085
I/O READ CYCLE OF 8085
I/O WRITE CYCLE OF 8085
INTERRUPT ACKNOWLEDGE
CYLE
BUS IDLE CYCLE
EXAMPLE :MVI B, 43
EXAMPLE INSTRUCTION :
STA 526A

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