Chapter 14 Enhanced Capture Timer (ECT16B8CV3)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
555
14.3.2.26 Precision Timer Prescaler Select Register (PTPSR)
Read: Anytime
Write: Anytime
All bits reset to zero.
Module Base + 0x002E
7
6
5
4
3
2
1
0
R
PTPS7
PTPS6
PTPS5
PTPS4
PTPS3
PTPS2
PTPS1
PTPS0
W
Reset
0
0
0
0
0
0
0
0
Figure 14-48. Precision Timer Prescaler Select Register (PTPSR)
Table 14-32. PTPSR Field Descriptions
Field
Description
7:0
PTPS[7:0]
Precision Timer Prescaler Select Bits
— These eight bits specify the division rate of the main Timer prescaler.
These are effective only when the PRNT bit of TSCR1 is set to 1.
shows some selection examples
in this case.
The newly selected prescale factor will not take effect until the next synchronized edge where all prescale counter
stages equal zero.
Table 14-33. Precision Timer Prescaler Selection Examples when PRNT = 1
PTPS7
PTPS6
PTPS5
PTPS4
PTPS3
PTPS2
PTPS1
PTPS0
Prescale
Factor
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
2
0
0
0
0
0
0
1
0
3
0
0
0
0
0
0
1
1
4
0
0
0
0
0
1
0
0
5
0
0
0
0
0
1
0
1
6
0
0
0
0
0
1
1
0
7
0
0
0
0
0
1
1
1
8
0
0
0
0
1
1
1
1
16
0
0
0
1
1
1
1
1
32
0
0
1
1
1
1
1
1
64
0
1
1
1
1
1
1
1
128
1
1
1
1
1
1
1
1
256
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Trade
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