In which of the following data transfer modes does the CPU constantly monitor…
2022
In which of the following data transfer modes does the CPU constantly monitor the peripheral and stay in a program loop until the peripheral device becomes ready for data transfer?
- A.
Direct Memory Access (DMA) mode
- B.
Direct Register Access (DRA) mode
- C.
Programmed I/O mode
- D.
Interrupt initiated I/O mode
Attempted by 119 students.
Show answer & explanation
Correct answer: C
The described mode is programmed I/O. The CPU continuously polls the peripheral status register and remains in a loop until the device becomes ready for data transfer.