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status register are connected to the data bus. The status register contains information relevant to the operation of the I/O module.

The status register is a hardware register that contains information about the state of the processor. Individual bits are implicitly or explicitly read and/or written by the machine code instructions executing on the processor. The status register lets an instruction take action contingent on the outcome of a previous instruction.

Typically, flags in the status register are modified as effects of arithmetic and bit manipulation operations. A status register may often have other fields as well, such as more specialized flags, interrupt enable bits, and similar types of information.

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Ayush Upadhyaya asked Oct 30, 2018
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I think percentage of processor time consumed should be $\frac{ \,ISR\,time}{ISR\,time+\,Data\,Transfer\,Time}=\frac{100}{100+122}$.Is it correct?