1) Program a timer to generate interrupt after every 50 msec (assuming you are using 12MHz)
2) Use a variable to count the number of timer ISR, and act when your desired time is finished.

e.g. with 50 msec timer, a delay of 1 sec requires that timer interrupt occurs 20 times.

Of course, there are lot of other possible ways and if you are using C, then what is problem obtaining the required delay?