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Author: AashiDutt

Interrupt/ckt.png

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+// Code for Interrupt using Level Triggered Mode
+// We are witting a code for square wave generator such that when an interrupt occurs the state of LED changes
+	
+#include<reg51.h>
+
+void MSDelay(unsigned int);
+
+sbit sq_wave=P1^3;
+sbit LED=P1^4;
+sbit SW=P3^2;
+
+void EINT_LED() interrupt 0 
+{
+LED=~LED;  //cpl
+MSDelay(500);	
+}
+
+void MSDelay(unsigned int time)
+{
+unsigned int i,j;
+for (i=0;i<time;i++)
+for (j=0;j<113;j++);
+}
+
+void main() 
+{
+SW=1; // p3.2 input
+LED=0;
+IT0=0; //LEVEL TRIGGERED
+IE=0x81; //enable interrupt for EINT0 EXTERNAL INTERRUPT 0
+while (1) 
+{
+sq_wave=1; 
+MSDelay(500);
+sq_wave=0;
+MSDelay(500);
+}
+}
+