8051 Micro-controller

Sample Codes

Timer code :
#include <reg51.h>
sbit T11=P3^5;
void main(void){T11=1;TMOD=0x60;TH1=0;while (1) {do {TR1=1;P1=TL1;}while (TF1==0);TR1=0;TF1=0;}}

Timer Interrupt:
#include <reg51.h>
sbit WAVE =P2^1;unsigned char cnt;
void tim() interrupt 1   {WAVE=~WAVE; //toggle pin}
void ti() interrupt 3  {cnt++; //increment counterP0=cnt; //display value on pins}
void main()  {cnt=0; //set counter to 0TMOD=0x22;TH0=-46; //10 KHzIE=0x8f; //enable interruptsTR0=1; //start timer 0TR1=1;while (1); //wait until interrupted}

External Interrupt:
#include<reg51.h>
void ex0_isr (void) interrupt 0 { // Interrupt subroutine for ext interrupt o unsigned int i; P0=0xAA; // Turn on Port 0 for the interrupt for (i=0;i<20000;i++); // Wait for some time} void ex1_isr (void) interrupt 2 { // Interrupt subroutine for ext interrupt o unsigned int i; P0=0x55; // Turn on Port 0 for the interrupt for (i=0;i<20000;i++); // Wait for some time}
void main(void){ IT1 =1; EX1 =1;IT0 = 1; // Configure interrupt 0 for falling edge on /INT0 (P3.2)EX0 = 1; // Enable EX0 InterruptEA = 1; // Enable Global Interrupt Flag while(1);
}

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