Chapter 7 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V5)
S12ZVHY/S12ZVHL Family Reference Manual, Rev. 1.05
Freescale Semiconductor
245
7.3.2.4
S12CPMU_UHV_V5 Post Divider Register (CPMUPOSTDIV)
The POSTDIV register controls the frequency ratio between the VCOCLK and the PLLCLK.
Read: Anytime
Write: If PLLSEL=1 write anytime, else write has no effect
When changing the POSTDIV[4:0] value or PLL transitions to locked stated (lock=1), it takes up to 32
Bus Clock cycles until f
PLL
is at the desired target frequency. This is because the post divider gradually
changes (increases or decreases) f
PLL
in order to avoid sudden load changes for the on-chip voltage
regulator.
7.3.2.5
S12CPMU_UHV_V5 Interrupt Flags Register (CPMUIFLG)
This register provides S12CPMU_UHV_V5 status bits and interrupt flags.
Module Base + 0x0006
7
6
5
4
3
2
1
0
R
0
0
0
POSTDIV[4:0]
W
Reset
0
0
0
0
0
0
1
1
= Unimplemented or Reserved
Figure 7-7. S12CPMU_UHV_V5 Post Divider Register (CPMUPOSTDIV)
fPLL
fVCO
POSTDIV 1
+
-----------------------------------------
=
If PLL is locked (LOCK=1)
If PLL is not locked (LOCK=0)
fPLL
fVCO
4
---------------
=
fbus
fPLL
2
-------------
=
If PLL is selected (PLLSEL=1)
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...
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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...
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