S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
149
Be aware that the output frequency varies with the TC trimming. A
frequency trimming correction is therefore necessary. The values provided
in
are typical values at ambient temperature which can vary from
device to device.
4.3.2.21
S12CPMU_UHV_V8 Oscillator Register (CPMUOSC)
This register configures the external oscillator (XOSCLCP).
Read: Anytime
Write: Anytime if PROT=0 (CPMUPROT register) and PLLSEL=1 (CPMUCLKS register). Else write
has no effect.
NOTE
.
Write to this register clears the LOCK and UPOSC status bits.
0x02FA
7
6
5
4
3
2
1
0
R
OSCE
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
Figure 4-30. S12CPMU_UHV_V8 Oscillator Register (CPMUOSC)
Table 4-28. CPMUOSC Field Descriptions
Field
Description
7
OSCE
Oscillator Enable Bit
— This bit enables the external oscillator (XOSCLCP). The UPOSC status bit in the
CPMUFLG register indicates when the oscillation is stable and OSCCLK can be selected as source of the Bus
Clock or source of the COP or RTI.
If the oscillator clock monitor reset is enabled (OMRE = 1 in CPMUOSC2
register), then a loss of oscillation will lead to an oscillator clock monitor reset.
0 External oscillator is disabled.
REFCLK for PLL is IRCCLK.
1 External oscillator is enabled. External oscillator is qualified by PLLCLK
REFCLK for PLL is the external oscillator clock divided by REFDIV.
If OSCE bit has been set (write “1”) then the EXTAL and XTAL pins are exclusively reserved for the
oscillator and they can not be used anymore as general purpose I/O until the next system reset.
Note:
When starting up the external oscillator (either by programming OSCE bit to 1 or on exit from Full Stop
Mode with OSCE bit already 1) the software must wait for a minimum time equivalent to the startup-time
of the external oscillator t
UPOSC
before entering Pseudo Stop Mode.
Summary of Contents for MC9S12VRP64
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Page 46: ...Device Overview S12VRP Series MC9S12VRP Family Reference Manual Rev 1 3 46 NXP Semiconductors ...
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