8085 Machine Cycle and Bus Timing Diagrams

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8085 machine cycle and bus timing diagrams • 74 instructions • Each has two parts:operation code and operand. • Machine cycle:time required by the MP to complete the operation of accessing memory or i/o device • Operations like opcode fetch ,M read,M write,i/o read,i/o write are performed in a machine cycle.

Transcript of 8085 Machine Cycle and Bus Timing Diagrams

Page 1: 8085 Machine Cycle and Bus Timing Diagrams

8085 machine cycle and bus timing diagrams

• 74 instructions • Each has two parts:operation code and

operand.• Machine cycle:time required by the MP to

complete the operation of accessing memory or i/o device

• Operations like opcode fetch ,M read,M write,i/o read,i/o write are performed in a machine cycle.

Page 2: 8085 Machine Cycle and Bus Timing Diagrams

MP EXTERNAL COMMUNICATION FUNCTIONS

• MEMORY READ AND WRITE• I/O READ AND WRITE• REQUEST ACKNOWLEDGE

Page 3: 8085 Machine Cycle and Bus Timing Diagrams

• EACH INTRUCTIONS HAS one or more machine cycles

• Each machine cycle is divided into T-states• MP perform an operation in specific time

period (clock cyle) called T-state.• The no of T-states required to perform an

operation is also called machine cycle

Page 4: 8085 Machine Cycle and Bus Timing Diagrams

Opcode fetch machine cycle

Each instruction of the processor has one byte opcode. • The opcodes are stored in memory. So, the processor executes the

opcode fetch machine cycle to fetch the opcode from memory. • Hence, every instruction starts with opcode fetch machine cycle. • The time taken by the processor to execute the opcode fetch cycle

is 4T. • In this time, the first, 3 T-states are used for fetching the opcode

from memory and the remaining T-states are used for internal operations by the processor.

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Timing Diagram for Opcode Fetch Machine Cycle

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Memory Read Machine Cycle of 8085:

The memory read machine cycle is executed by the processor to read a data byte from memory.

• The processor takes 3T states to execute this cycle.

• The instructions which have more than one byte word size will use the machine cycle after the opcode fetch machine cycle.

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Page 8: 8085 Machine Cycle and Bus Timing Diagrams

Memory Write Machine Cycle of 8085:

• The memory write machine cycle is executed by the processor to write a data byte in a memory location.

• The processor takes, 3T states to execute this machine cycle.

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Page 10: 8085 Machine Cycle and Bus Timing Diagrams

I/O Read Cycle of 8085

• The I/O Read cycle is executed by the processor to read a data byte from I/O port or from the peripheral, which is I/O, mapped in the system.

• The processor takes 3T states to execute this machine cycle.

• The IN instruction uses this machine cycle during the execution.

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Page 12: 8085 Machine Cycle and Bus Timing Diagrams

I/O Write Cycle of 8085:

• The I/O write machine cycle is executed by the processor to write a data byte in the I/O port or to a peripheral, which is I/O, mapped in the system.

• The processor takes, 3T states to execute this machine cycle.

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8085 Timing Diagrams2

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