A microprocessor accepts external interrupts Ext INT through a Programmable Interrupt Controller as shown in the figure GATE Instrumentation Engineering 2014

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A microprocessor accepts external interrupts (Ext INT) through a Programmable Interrupt Controller as shown in the figure. GATE-Instrumentation-Engineering-2014




Assuming  vectored  interrupt,  a  correct  sequence  of  operations  when  a  single  external interrupt  (ExtINT1) is received will be :
(A) Ext INT1→INTA→Data Read→INT
(B) Ext INT1→INT→INTA→Data Read
(C) Ext INT1→INT→INTA→Address Write
(D) Ext INT1→INT→Data Read→Address Write


By:tarun101

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Answers

(B) Ext INT1→INT→INTA→Data Read

In computing, a programmable interrupt controller (PIC) is a device that is used to combine several sources of interrupt onto one or more CPU lines, while allowing priority levels to be assigned to its interrupt outputs.




13priya

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