sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 264

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

S12 Clock, Reset and Power Management Unit (S12CPMU) Block Description
7.3.2.22
This register protects the clock configuration registers from accidental overwrite:
CPMUSYNR, CPMUREFDIV, CPMUCLKS, CPMUPLL, CPMUIRCTRIMH/L and CPMUOSC
Read: Anytime
Write: Anytime
264
0x02FB
Reset
PROT
Field
0
W
R
Clock Configuration Registers Protection Bit — This bit protects the clock configuration registers from
accidental overwrite (see list of affected 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. CPMUSYNR, CPMUREFDIV, CPMUCLKS, CPMUPLL,
S12CPMU Protection Register (CPMUPROT)
0
0
7
CPMUIRCTRIMH/L and CPMUOSC registers are not writable.
Figure 7-29. S12CPMU Protection Register (CPMUPROT)
0
0
6
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
0
0
5
0
0
4
Description
0
0
3
0
0
2
Freescale Semiconductor
0
0
1
PROT
0
0