Chapter 7 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V5)
S12ZVHY/S12ZVHL Family Reference Manual, Rev. 1.05
248
Freescale
Semiconductor
7.3.2.7
S12CPMU_UHV_V5 Clock Select Register (CPMUCLKS)
This register controls S12CPMU_UHV_V5 clock selection.
Read: Anytime
Write:
•
Only possible if PROT=0 (CPMUPROT register) in all MCU Modes (Normal and Special Mode).
•
All bits in Special Mode (if PROT=0).
•
PLLSEL, PSTP, PRE, PCE, RTIOSCSEL: In Normal Mode (if PROT=0).
•
CSAD: In Normal Mode (if PROT=0) until CPMUCOP write once has taken place.
•
COPOSCSEL0: In Normal Mode (if PROT=0) until CPMUCOP write once has taken place.
If COPOSCSEL0 was cleared by UPOSC=0 (entering Full Stop Mode with COPOSCSEL0=1 or
insufficient OSCCLK quality), then COPOSCSEL0 can be set once again.
•
COPOSCSEL1: In Normal Mode (if PROT=0) until CPMUCOP write once has taken place.
COPOSCSEL1 will not be cleared by UPOSC=0 (entering Full Stop Mode with COPOSCSEL1=1
or insufficient OSCCLK quality if OSCCLK is used as clock source for other clock domains: for
instance core clock etc.).
NOTE
After writing CPMUCLKS register, it is strongly recommended to read
back CPMUCLKS register to make sure that write of PLLSEL,
RTIOSCSEL and COPOSCSEL was successful. This is because under
certain circumstances writes have no effect or bits are automatically
changed (see CPMUCLKS register and bit descriptions).
NOTE
When using the oscillator clock as system clock (write PLLSEL = 0) it is
highly recommended to enable the oscillator clock monitor reset feature
(write OMRE = 1 in CPMUOSC2 register). If the oscillator monitor reset
feature is disabled (OMRE = 0) and the oscillator clock is used as system
clock, the system will stall in case of loss of oscillation.
Module Base + 0x0009
7
6
5
4
3
2
1
0
R
PLLSEL
PSTP
CSAD
COP
OSCSEL1
PRE
PCE
RTI
OSCSEL
COP
OSCSEL0
W
Reset
1
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 7-10. S12CPMU_UHV_V5 Clock Select Register (CPMUCLKS)
Содержание MC9S12ZVHL32
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Страница 686: ...Chapter 20 ECC Generation module SRAM_ECCV1 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 686 Freescale Semiconductor...
Страница 752: ...Chapter 22 Supply Voltage Sensor BATSV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 752 Freescale Semiconductor...
Страница 774: ...Chapter 23 LIN Physical Layer S12LINPHYV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 774 Freescale Semiconductor...
Страница 788: ...Appendix A MCU Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 788 Freescale Semiconductor...
Страница 794: ...Appendix B ADC Electricals S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 794 Freescale Semiconductor...
Страница 798: ...Appendix D IRC Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 798 Freescale Semiconductor...
Страница 802: ...Appendix F MSCAN Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 802 Freescale Semiconductor...
Страница 806: ...Appendix G NVM Electrical Parameters S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 806 Freescale Semiconductor...
Страница 810: ...Appendix H BATS Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 810 Freescale Semiconductor...
Страница 816: ...Appendix K OSC32K Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 816 Freescale Semiconductor...
Страница 822: ...Appendix L SPI Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 822 Freescale Semiconductor...
Страница 826: ...Appendix M LINPHY Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 826 Freescale Semiconductor...
Страница 829: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 830 Freescale Semiconductor O 1 144 LQFP...
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