Motorola MVME172 用户手册

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页码 354
Programming Model
http://www.mcg.mot.com/literature
3-17
3
Tick Timer 2 Counter  
LSB Prescaler Count Register
This register is used to generate the 1 MHz clock for the four tick timers. 
This register is read-only. It increments to $ff at the processor frequency, 
then it is loaded from the Prescaler Clock Adjust Register.
ADR/SIZ
$FFF42010 (32 bits)
BIT
31
.  .  .
0
NAME
Tick Timer 2 Counter
OPER
R/W
RESET
X
ADR/SIZ
$FFF42014 (8 bits)
BIT
31
...
24
NAME
LSB Prescaler Count
OPER
R
RESET
X