Is I use on STC software source code as follows, timing function directly copy the/ps I always don't understand how to write the timer code,
If the timer function in a loop inside, it is necessary to perform again only after the whole cycle timer function, it should lead to counting inaccurate?
Excuse me, how can achieve accurate count a second?

 
//digital tube clock program 
#include  
#include  
# define uint unsigned int 
# define uchar unsigned char 
Sbit du=P2 ^ 6; 
Sbit we=P2 ^ 7; 

Int num=0; 
Int shi=3; 
Int fen=2; 
Int miao=0; 
//uchar hour=8, minute=5, the SEC=1; 
Int miao2=0, fen2=5, shi2=2; 
SFR AUXR=0 x8e; 

Uchar duan []={x5b x3f 0, 0 x06, 0, 0 x4f, 0 x66, 0 x6d, 0 x7d, 0 x07, 0 x7f, 0 x6f};//section of the code 
Uchar wei []={XFD 0 xfe, 0, 0 XFB, 0 xf7, 0 xef, 0 XDF, 0 XBF, 0 x7f};//a 

Void Timer1Init (void)//1 millisecond @ 11.0592 MHz 
{
AUXR |=0 x40;//timer 1 t model 
TMOD & amp;=0 x0f;//set the timer mode 
TL1=0 XCD;//set the timer initial 
TH1=0 xd4;//set the timer initial 
TF1=0;//remove TF1 sign 
TR1=1;//timing starts the timer 1 
Num++; 
} 

Void delay (uint k)//software delay 
{
Uint I; 
uint j; 

for(i=0; I & lt; k; I++) 
for(j=0; J & lt; 80; j++);//raw data j & lt; 114 
} 

Void jisuan () 
{
If (num==100) 
{
Miao++; 
Num=0; 
} 
If (miao==10) 
{
Miao2 + +; 
Miao=0; 
} 

//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
If (miao2==6) 
{
Fen + +; 
Miao2=0; 
} 
If (fen==10) 
{
Fen2 + +; 
Fen=0; 
} 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
If (fen2==6) 
{
Shi++; 
Fen2=0; 
} 
If (shi==10) 
{
Shi2 + +; 
Shi=0; 
} 
If (shi2==2 & amp; Shi==4) 
{
Shi=0; 
Shi2=0; 
} 
} 
//=============the main function================
//=============the main function================
Void main () 
{
While (1) 
{
Timer1Init (); 
Jisuan (); 
Du=1; 
P0=duan (miao), 
Du=0; 
We=1; 
P0=wei [7]; 
We=0; 
Delay (1); 
Du=1; 
P0=duan [miao2]; 
Du=0; 
We=1; 
P0=wei [6]. 
We=0; 
Delay (1); 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
Du=1; 
P0=0 x40; 
Du=0; 
We=1; 
P0=wei [5]; 
We=0; 
Delay (1); 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
Du=1; 
P0=duan (fen); 
Du=0; 
We=1; 
P0=wei [4]; 
We=0; 
Delay (1); 
Du=1; 
P0=duan [fen2]; 
Du=0; 
We=1; 
P0=wei [3]. 
We=0; 
Delay (1); 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
Du=1; 
P0=0 x40; 
Du=0; 
We=1; 
P0=wei [2]; 
We=0; 
Delay (1); 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
Du=1; 
P0=duan (shi); 
Du=0; 
We=1; 
P0=wei [1]; 
We=0; 
Delay (1); 
Du=1; 
P0=duan [shi2]; 
Du=0; 
We=1; 
P0=wei [0]; 
We=0; 
Delay (1); 
} 
} 

CodePudding user response:

51 cheat chicken egg use interrupts are not accurate, only using an external clock chip can more accurately,

CodePudding user response:

With external crystals, but seem to call after the program or can't obtain accurate time

CodePudding user response:

Why Timer1Init into the loop?