1sec delay using timer in 8051

anboli · Jan 9, 2013

hi, im using the timer newly and i dono how to create a delay value for 1sec.

please anyone help me how to program or what the value i should need to give for the timer registers.

and im using a 12MHz crystal.

mannu2612 · Jan 10, 2013

anboli said:
hi, im using the timer newly and i dono how to create a delay value for 1sec.

please anyone help me how to program or what the value i should need to give for the timer registers.

and im using a 12MHz crystal.

8051 timers use 1/12 of the crystal frequency regardless of machine cycle.
Thus timer's clock frequency= 12/12=1MHz.
And T=1/1=1us.
Now by using 16 bit timer mode we can count from 0 to 65536.
which gives a delay of 65536 us.So by iterating we can get the desired delay as shown below:
No. of times to loop: 1/(65536u)=15.25
So by repeating the counts for 15 times we can get a delay of 1 sec(not accurate though).

1sec delay using timer in 8051

anboli

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mannu2612

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1sec delay using timer in 8051

anboli

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mannu2612

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