A few instructions in the instruction set of the 8051 microcontrollers take the same shortest time to execute. What is the number of machine cycles required to execute these instructions?

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BSPHCL JE Electrical 2019 Official Paper: Batch 2 (Held on 30 Jan 2019)

Answer 1

Machine cycle

The CPU takes a certain number of clock cycles to execute an instruction. In the 8051 microcontrollers, these clock cycles are referred to as machine cycles.
The length of the machine cycle depends on the frequency of the crystal oscillator connected to the 8051 system.
The frequency of the crystal connected to the 8051 families can vary from 4 MHz to 30 MHz, depending on the chip rating and manufacturer.
The number of machine cycles required to execute an instruction is one.
In the 8051 microcontrollers, one machine cycle consists of 6 T-states or 12 clock cycles.