The controller also tells the device with two extra interrupts, which priority interrupt should be given to the processor. This is important because the interrupt handler is executed whenever a new instruction reaches the processor. In practice, the interrupt handler should try to accommodate new instructions until an instruction of priority is reached, and than yield to it.
A 4-bit encoder typically consists of a crossbar which has 4 switches. The decoder provides a name for each switch, and these labels serve two purposes: for ec5d62056f