S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
121
4.3.2.3
S12CPMU_UHV_V8 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
4.3.2.4
S12CPMU_UHV_V8 Flags Register (CPMUFLG)
This register provides S12CPMU_UHV_V8 status bits and flags.
Read: Anytime
Write: Refer to each bit for individual write conditions
0x0036
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 4-6. S12CPMU_UHV_V8 Post Divider Register (CPMUPOSTDIV)
0x0037
7
6
5
4
3
2
1
0
R
RTIF
PORF
LVRF
LOCKIF
LOCK
ILAF
OSCIF
UPOSC
W
Reset
0
Note 1
Note 2
0
0
Note 3
0
0
1. PORF is set to 1 when a power on reset occurs. Unaffected by System Reset.
2. LVRF is set to 1 when a low voltage reset occurs. Unaffected by System Reset. Set by power on reset.
3. ILAF is set to 1 when an illegal address reset occurs. Unaffected by System Reset. Cleared by power on reset.
= Unimplemented or Reserved
Figure 4-7. S12CPMU_UHV_V8 Flags Register (CPMUFLG)
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 MC9S12VRP64
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Страница 529: ...MC9S12VRP Family Reference Manual Rev 1 3 NXP Semiconductors 529 Appendix J Package Information ...
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