Hi Mou,
Sorry that your post has gone unanswered for a week.
The MC1319x contains a timer block, clocked from the 16MHz crystal. There is a prescaler for the timer found in register 0x09. This defaults to a timer clock of 250kHz. The current counter value is in registers 27 and 28, and the timebase for this is the output of the presclaer block. Assuming the default 250kHz, this gives a timer quantization of 4us, so each increment of the timer is 4 us. Your programming below will cause a timer event in 8 useconds.
Hope that helps
Mark