MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The 8086 has two hardware interrupt pins, i.e. NMI and INTR. NMI is a non-maskable interrupt and INTR is a maskable interrupt having lower priority. One more interrupt pin associated is INTA called interrupt acknowledge.

Detailed explanation-2: -In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore. It typically occurs to signal attention for non-recoverable hardware errors. Some NMIs may be masked, but only by using proprietary methods specific to the particular NMI.

Detailed explanation-3: –TYPE 0 interrupt represents division by zero situation.-TYPE 1 interrupt represents single-step execution during the debugging of a program.-TYPE 2 interrupt represents non-maskable NMI interrupt.-TYPE 3 interrupt represents break-point interrupt.

Detailed explanation-4: -A non-maskable is an interrupt which can not be disabled. RST 7.5, RST 5.5 are maskable interrupts but TRAP is a non-maskable interrupt.