How can I set the exact delay time in microcontroller(at89c51)? (Keil)

[buts101]

Delay() in at89c51

how can i set the exact delay time in microcontroller(at89c51)...? delay() function of C is not support by keil compiler.

 

[Unomano]

Re: Delay() in at89c51

Try this:

//------------------------------------------------------------------------------
//	Processing of Timer 0 interrupt request
//------------------------------------------------------------------------------
void Timer0(void) interrupt 1
{
	counter++;
	TH0 = TH_0;
	TL0 = TL_0;
	TF0 = 0;
}

//------------------------------------------------------------------------------
//	Generates Time*1/100 s delay
//------------------------------------------------------------------------------
void Delay(unsigned char Time)
{
	counter = 0;
	while(counter < Time);
}

if fOSC = 22.1184 MHz:
TL_0 = 0x00
TH_0 = 0xB8
it corresponds to 1/100 s overflow

 

[wek]

Delay() in at89c51

Unomano,

What's the purpose of setting TF to 0?

wek

 

[tofinhk]

Delay() in at89c51

TF0 should be the overflow flag
The timer will not continue if it is set. So you should clear TF0 to restart the timer.

 

[deepanshu203]

Re: Delay() in at89c51

Can't we try to use two for() loops in nested format for the same purpose?

 

[Unomano]

Re: Delay() in at89c51

You need to use timer to get exact delays.

Can't we try to use two for() loops in nested format for the same purpose?