Timer Module (TIM16B2CV3)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
353
Read: Anytime
Write: Anytime
All bits reset to zero.
11.3.2.14 Precision Timer Prescaler Select Register (PTPSR)
Read: Anytime
Write: Anytime
All bits reset to zero.
...
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 11-17. Precision Timer Prescaler Selection Examples when PRNT = 1
Table 11-15. OCPD Field Description
Note:
Writing to unavailable bits has no effect. Reading from unavailable bits return a zero.
Field
Description
1:0
OCPD[1:0]
Output Compare Pin Disconnect Bits
0 Enables the timer channel port. Output Compare action will occur on the channel pin. These bits do not affect
the input capture .
1 Disables the timer channel port. Output Compare action will not occur on the channel pin, but the output
compare flag still become set.
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 11-21. Precision Timer Prescaler Select Register (PTPSR)
Table 11-16. 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.
PTPS7
PTPS6
PTPS5
PTPS4
PTPS3
PTPS2
PTPS1
PTPS0
Prescale
Factor
0
0
0
0
0
0
0
0
1
Содержание MC9S12VRP64
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