mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 160

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Clock, Reset and Power Management (S12CPMU_UHV)
4.3.2.22
This register protects the clock configuration registers from accidental overwrite:
CPMUSYNR, CPMUREFDIV, CPMUCLKS, CPMUPLL, CPMUIRCTRIMH/L and CPMUOSC
Read: Anytime
Write: Anytime
160
0x02FB
Reset
PROT
Field
W
R
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).
S12CPMU_UHV Protection Register (CPMUPROT)
0
0
7
Figure 4-31. S12CPMU_UHV Protection Register (CPMUPROT)
0
0
6
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
0
0
5
0
0
4
Description
0
0
3
Rev. 2.2
0
0
2
Freescale Semiconductor
0
0
1
PROT
0
0