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1sec delay program for 89c51

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srinivasan2323

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89c51 1ms delay

hi i need a 1sec delay program for my 89c51 program
 

1 sec delay using timer in 89c51



rgds,
IanP
 

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delay using timer of 89c51

Ist make delay of 50ms using 16 bit timer
then call it 20 times
 

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how to find loop delay c in 89c51

Hi;

when u load 00 in 16 bit timer it takes 71.1msec to reach FF and overflow.
so 71.1msec *14times loop gives appx 995msec. for looping back in your program after overflow all corresponds to 1sec delay. So write a program with 00 in timer and repeat it for 14 times.
measure it you will get 1 sec delay.

write in assembly only not in C.
 

void delay1s(void){
unsigned char count = 50;
while(count>0){
TH0=183;
TL0=255;
TMOD=1;
TR0=1;
while(!TF0){
}
TF0=0;
TR0=0;
count--;
}

}
 

srinivasan2323 said:
hi i need a 1sec delay program for my 89c51 program
Click to expand...

Best way u use Timer insted of for loop for exact timing.
First u can load the value in 16 - bit timer for 50 ms. so loading the timer for 20 times,u will get exact 1 sec delay.
 

hi,
you can decide to use timers or a routine call
for instance,
mov r0,#4
mov r1,#250
mov r2,#250
lop:
nop
nop
djnz r1,$
djnz r2,$
djnz r0,lop
end
such program would give a isecond delay but alternatively one may decide to use the timers of the 89c51
 
first tell me the crystal value which u r using for system
 
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