A microprocessor accepts external interrupts (Ext INT) through a Programmable Interrupt Controller as shown in the figure.
Assuming vectored interrupt, a correct sequence of operations when a single extrenal interrupt (Ext INT1) is received will be :
- $Ext\;INT1\rightarrow INTA\rightarrow Data\;Read\rightarrow INT$
- $Ext\;INT1\rightarrow INT \rightarrow INTA \rightarrow Data\;Read$
- $Ext\;INT1\rightarrow INT \rightarrow INTA \rightarrow Address\;Write$
- $Ext\;INT1\rightarrow INT\rightarrow Data\;Read\rightarrow Address\;Write$