"Beginner's C51 Self-study Notes" Timer Code (Part 3)-EEWORLD

Collect

Initialization procedure:

Assign values to TMOD to determine how T0 and T1 work.

Calculate the initial value and write it into TH0, TL0 or TH1, TL1.

In interrupt mode, assign values to EA and enable timer interrupt.

Set TR0 or TR1 to start the timer/counter timing or counting.

//Function realization: Digital tube increases by one per second;

#include

#define uchar unsigned char

#define uint unsigned int

unsigned char code smg_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};

void main()

{

TMOD=0x01; //Set timer 0 to working mode 1

TH0=(65536-50000)/256; //Set the initial value once every 50ms

TL0=(65536-50000)%256;

EA=1; //Turn on the general interrupt switch

ET0=1; //Enable timer interrupt

TR0=1; //Start the timer

while(1)

{

if(kk==20) // 20 times is 1 second

{

k=0;

P1=smg_du[num];

num++;

if(num==10) //Prevent array overflow

num=0;

}

void timer0 () interrupt 1

{

TH0=(65536-50000)/256; //Set the initial value

TL0=(65536-50000)%256;

k++;

}

Reference address："Beginner's C51 Self-study Notes" Timer Code (Part 3)

Previous article："Beginner's C51 Self-study Notes" - Four working modes of timer (Part 2)
Next article："Beginner's C51 Self-study Notes" Serial Port

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