S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
150
NXP Semiconductors
4.3.2.22
S12CPMU_UHV_V8 Protection Register (CPMUPROT)
This register protects the clock configuration registers from accidental overwrite:
CPMUSYNR, CPMUREFDIV, CPMUCLKS, CPMUPLL, CPMUIRCTRIMH/L, CPMUOSC and
CPMUOSC2
Read: Anytime
Write: Anytime
0x02FB
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
PROT
W
Reset
0
0
0
0
0
0
0
0
Figure 4-31. S12CPMU_UHV_V8 Protection Register (CPMUPROT)
Field
Description
PROT
Clock Configuration Registers Protection Bit
— This bit protects the clock configuration registers from
accidental overwrite (see list of protected registers above): Writing 0x26 to the CPMUPROT register clears the
PROT bit, other write accesses set the PROT bit.
0 Protection of clock configuration registers is disabled.
1 Protection of clock configuration registers is enabled. (see list of protected registers above).
Summary of Contents for MC9S12VRP64
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