Microcontroller timer 0, 1 demonstration program

//Experimental routine Prawn (DX-51) learning board timer 0, 1 usage routine

#include

#include

//MCU51 embedded professional emulator occupies 3 bytes of program space 0x003b, 0x003c, 0c003d,

//Use the code array declaration to prevent the compiler from locating the function in the program space where this three bytes are located.

unsigned char code DX58[3] _at_ 0x003b;

unsigned char count;

unsigned char direction;

unsigned char delay1;

unsigned char delay2;

void timer0(void) interrupt 1 using 0

{

TL0=0x06;

TH0=delay2;

/* Timer 0 interrupt*/

if (++delay1 > 4){

delay1 = 0;

if (++count > 7) count = 0;

P1 |= 0x0ff;

P1 &= ~(0x01 << count);

}

/* Timer 0 interrupt*/

}

void timer1(void) interrupt 3 using 0

{

TL1=0x06;

TH1=0x00;

/* Timer 1 interrupt*/

if (direction){

if (++delay2 == 128)direction = 0;

}

else {

if (--delay2 == 0)direction = 1;

}

/* Timer 1 interrupt*/

}

// Timer function demonstration program

// P01, P02, P03, P04 pins are connected to the light-emitting diodes led1, led2, led3, led4

// Connect the resistor on each LED string to the 5V power supply and run this demonstration program

// You will see the light-emitting diodes light up and go out in sequence, which is more beautiful than the colorful lights on the street.

// There are too many. If you don’t believe me, try it.

void main(void){

ET0 = 1; /* Allow timer 0 interrupt*/

ET1 = 1; /* Allow timer 1 interrupt*/

TMOD = 0x11; /* Timer working mode selection*/

TL0 = 0x06;

TH0 = 0x00; /* Assign initial value to timer*/

TL1 = 0x06;

TH1 = 0x00; /* Assign initial value to timer*/

TR0 = 1; /* Start timer*/

TR1 = 1; /* Start timer*/

EA = 1; /* Turn on total interrupt */

delay2 = 0;

direction = 1;

while(1){

_nop_ (); /* delay for hardware */

}

}