The number of 'T' states needed for executing a particular instruction can be calculated using the formula:

T states = (Time required for execution / Clock period)

Given that the clock frequency of the 8085 microprocessor is 5 MHz (5 million cycles per second), and the time required to execute the instruction is 1.2 μs, we can calculate the number of 'T' states as follows:

1. Calculate the clock period:
Clock period = 1 / Clock frequency
Clock period = 1 / 5 MHz
Clock period = 0.2 μs

2. Calculate the number of 'T' states:
T states = (Time required for execution / Clock period)
T states = 1.2 μs / 0.2 μs
T states = 6

So, the number of 'T' states needed for executing the particular instruction is 6.

Explanation:

The 8085 microprocessor operates based on a clock signal, which determines the timing of instructions and data transfers. The clock frequency represents the number of clock cycles per second. In this case, the clock frequency is given as 5 MHz, which means the microprocessor can perform 5 million clock cycles per second.

The time required to execute a particular instruction is given as 1.2 μs. To calculate the number of 'T' states, we need to determine how many clock cycles are needed to execute the instruction.

First, we calculate the clock period by taking the reciprocal of the clock frequency. In this case, the clock period is 0.2 μs.

Then, we divide the time required for execution by the clock period to find the number of 'T' states. In this case, the calculation becomes 1.2 μs / 0.2 μs, resulting in 6 'T' states.

The 'T' state is a measure of the time taken to perform a single operation within the microprocessor. It is important for timing and synchronization purposes, as different instructions may require different numbers of 'T' states to execute.

By calculating the number of 'T' states, we can determine the timing requirements of the microprocessor and ensure proper execution of instructions.