Техническая Спецификация для Freescale Semiconductor Tower System Eval Kit for MC9S12GN32 TWR-S12GN32-KIT TWR-S12GN32-KIT
Модели
TWR-S12GN32-KIT
Timer Module (TIM16B8CV3)
MC9S12G Family Reference Manual,
Rev.1.23
772
Freescale Semiconductor
...
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
Table 23-24. Precision Timer Prescaler Selection Examples when PRNT = 1
23.4
Functional Description
This section provides a complete functional description of the timer TIM16B8CV3 block. Please refer to
the detailed timer block diagram in
the detailed timer block diagram in
Table 23-23. 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.
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.
The newly selected prescale factor will not take effect until the next synchronized edge where all prescale counter
stages equal zero.
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
1
0
0
1
1
20
0
0
0
1
0
1
0
0
21
0
0
0
1
0
1
0
1
22
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
1
1
1
1
1
0
0
253
1
1
1
1
1
1
0
1
254
1
1
1
1
1
1
1
0
255
1
1
1
1
1
1
1
1
256