1sec delay using timer in 8051

Status
Not open for further replies.
A

anboli

Full Member level 2
Joined
Mar 9, 2012
Messages
144
Helped
4
Reputation
8
Reaction score
4
Trophy points
1,298
Activity points
2,512
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.
 

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.
Click to expand...

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).
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…