8051-HARDWARE INTERRUPT TUTORIAL
PROGRAM:
#include<reg51.h>
sbit wav=P1^1;
void timer() interrupt 0
{
wav=~wav;
}
void main()
{
TMOD=0x42;
TCON=0x01;
IE=0x81;
while(1);
}
8051 INTERFACING WITH 7 SEGMENT DISPLAY AND 3X3 MATRIX KEYPAD
PROGRAM: #include<reg52.h> void scankey(); void result(unsigned int m); void delay(unsigned int ms); sbit a=P2^0; sbit r1=P1^0; sbit r2=P1^1; sbit r3=P1^2; sbit r4=P1^3; sbit c1=P1^4; sbit c2=P1^5; sbit c3=P1^6; int value[10] = {0x3F, 0x06, 0x5B, 0x4F, 0x66,0x6D, 0x7D, 0x07, 0x7F, 0x6F}; void main() { a=1; scankey(); } void delay(unsigned int ms) { unsigned int i,j; for(i=0;i<=ms;i++) for(j=0;j<1275;j++); } void scankey() { c1=1;c2=1;c3=1; while(1) { r1=0; r2=1; r3=1; r4=1; if(c1==0){delay(20);while(c1==0);result(1);} if(c2==0){delay(20);while(c2==0);result(2);} if(c3==0){delay(20);while(c3==0);result(3);} r1=1; r2=0; r3=1; r4=1; if(c1==0){delay(20);while(c1==0);result(4);} if(c2==0){delay(20);while(c2==0);result(5);} if(c3==0){delay(20);while(c3==0);result(6);} r1=1; r2=1; r3=0; r...
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