Hi RajKumar,

yes, for low baudrates, if you need
a 16 bit timer, you must do software reload in the timer interrupt handler.

If no other interrupts used,
you can reload with a constant
value.
On using other interupts also,
it can give an unacceptable error.
Then you need a jitter free reload.
See my example:

www.specs.de/~danni/appl/soft/clock


Peter