PWM of servo motor using timer(mode 2) 89C51

[tahira]

 

hi all

 

i need a timer of 1usec,,using  timer mode 2 of  89C51.

issue is:  execution time of statements making up timer function is exceeding the net value of delay generated by timer,,

 

here it goes:

void timer()

{

TMOD=0x20;

TH1=0xFE;

TR1=1;

while(TF1==0);

TF1=0;

TR1=0;

}

 

we cn use 12/36 MhZ clock

 

 

plz repli

 

 

 

[AJISH ALFRED]

Hi Tahira,

You are continuously checking the timer flag inside a function to know whtehr the timer overflows or not, are you?. The better method is to enable the timer interrupt and use the timer ISR.

[Author]

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