Freescale Semiconductor MCF54455 Reference Manual page 753

DMA Timers (DTIM0–DTIM3)
For example, if a 133-MHz timer clock is divided by 16, DTMRn[PS] equals 0x7F, and the timer is
referenced at 0x1FB5B (129,883 decimal), the time-out period is:
Timeout period
30-11
1
  
= 16 127 + 1
---------------------- -
6

133 10
   
129883 + 1 = 2.00 seconds
Eqn. 30-2
Freescale Semiconductor