Main characteristic of interrupt modes of data transfer is that data exchange between peripheral and the processor is initiated by the device. The interrupt modes of data transfer are the same like normal Interrupt process in microprocessor 8085.
This mode is basically used for data transfer between slow peripherals and processor, and also when the occurrence of data is unpredictable in nature.
In billow I discuss on the details steps of interrupt modes of data transfer
An interrupt is requested by a peripheral device to processor.
After getting interrupt request an acknowledgement of the request is send by the processor at the end of the execution of the current instruction.