mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 393

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

The Prescaler can be calculated as follows depending on logical value of the PTPS[7:0] and PRNT bit:
PRNT = 1 : Prescaler = PTPS[7:0] + 1
12.4
This section provides a complete functional description of the timer TIM16B8CV3 block. Please refer to
the detailed timer block diagram in
Freescale Semiconductor
PTPS[7:0]
...
PTPS7
Field
7:0
0
0
0
0
0
0
0
1
1
1
1
-
-
-
-
-
-
Functional Description
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.
in this case.
The newly selected prescale factor will not take effect until the next synchronized edge where all prescale counter
stages equal zero.
PTPS6
Table 12-24. Precision Timer Prescaler Selection Examples when PRNT = 1
0
0
0
0
0
0
0
1
1
1
1
-
-
-
-
-
-
PTPS5
0
0
0
0
0
0
0
1
1
1
1
-
-
-
-
-
-
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
Table 12-23. PTPSR Field Descriptions
Figure 12-30
PTPS4
0
0
0
0
1
1
1
1
1
1
1
-
-
-
-
-
-
PTPS3
as necessary.
0
0
0
0
0
0
0
1
1
1
1
-
-
-
-
-
-
Description
PTPS2
0
0
0
0
0
1
1
1
1
1
1
-
-
-
-
-
-
Table 12-24
PTPS1
0
0
1
1
1
0
0
0
0
1
1
-
-
-
-
-
-
shows some selection examples
PTPS0
Timer Module (TIM16B8CV3)
0
1
0
1
1
0
1
0
1
0
1
-
-
-
-
-
-
Prescale
Factor
253
254
255
256
20
21
22
1
2
3
4
-
-
-
-
-
-
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