Timer/Counter Usage (Natural Interrupt Priority)

1. Initialize the timer
2. Write an interrupt subroutine (also called an interrupt function, in layman's terms, it is to call a function)
 
                    
                        Initialize the timer
      1) Set the timer/counter mode (in the front)
     2) Enable the timer interrupt (timer/counter 0 or 1 or other)
     3) Enable the timer/counter (timer/counter 0 or 1 or other)
     4) Enable the general interrupt
     5) Assign a value to the timer
    Note: The above steps can be disrupted but not omitted. (If some conditions are initialized in other functions, they can be omitted here)

                                     Writing an interrupt subroutine

        void tim0_isr (void) interrupt 1 
       1) void tim0_isr(void) (This is the function that needs to be executed after the interrupt) 
        2) interrupt 1 (There is a detailed description of the interrupt number before the interrupt number)
 

Code
 #include
sbit LED=P0^7; //define the LED pin to be lit
unsigned int i=0;

void tim0_isr (void) interrupt 1 //This is the interrupt execution function
{
i++; //Every interruption i+1
}

void csh_dsq_0() // Initialize timer/counter 0
{
TMOD = 0x02; // Use mode 3 (auto-reload mode)
TH0 = 0x00; // Timer 0 reload data (here is the value assigned when given)
TL0 = 0x00; // Initialization (here is the value assigned when given)
ET0 = 1; // Turn on timer 0 interrupt
TR0 = 1; // Enable timer 0
EA = 1; // Turn on general interrupt
} void main()
{
LED = 0;
csh_dsq_0(); // Call interrupt initialization
while (1)
{
if (i == 5000) // Interrupt 5000 times and LED turns on or off once
{
LED = ~LED; // LED turns on or off
i = 0; // Clear i to restart the interrupt count
}
}
}