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Chapter 8 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V6)
MC9S12ZVM Family Reference Manual Rev. 1.3
262
Freescale Semiconductor
8.3.2.7
S12CPMU_UHV_V6 Clock Select Register (CPMUCLKS)
This register controls S12CPMU_UHV_V6 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 8-10. S12CPMU_UHV_V6 Clock Select Register (CPMUCLKS)
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...