Question

Explain the sequence of events during the execution of the CALL instruction by 8085 processor with the help of neat timing diagram.​

Answer 1

Answer:

Instruction cycle in 8085 microprocessor

Explanation:

From the above question,

They have given :

The sequence of events during the execution of the CALL instruction by 8085 processor.

Time required to execute and fetch an entire instruction is called instruction cycle. It consists:

• Fetch cycle – The next instruction is fetched by the address stored in program counter (PC) and then stored in the instruction register.
• Decode instruction – Decoder interprets the encoded instruction from instruction register.
• Reading effective address – The address given in instruction is read from main memory and required data is fetched. The effective address depends on direct addressing mode or indirect addressing mode.
• Execution cycle – consists memory read (MR), memory write (MW), input output read (IOR) and input output write (IOW)
• The time required by the microprocessor to complete an operation of accessing memory or input/output devices is called machine cycle. One time period of frequency of microprocessor is called t-state. A t-state is measured from the falling edge of one clock pulse to the falling edge of the next clock pulse.
• Fetch cycle takes four t-states and execution cycle takes three t-states.

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