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Bit
Name
Reset
Access
Description
31:16
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1
(p. 3)15:0
LOCKKEY
0x0000
RW
Configuration Lock Key
Write any other value than the unlock code to lock CMU_CTRL, CMU_HFCORECLKDIV,
CMU_HFPERCLKDIV, CMU_HFRCOCTRL, CMU_LFRCOCTRL, CMU_AUXHFRCOCTRL, CMU_OSCENCMD, CMU_CMD,
CMU_LFCLKSEL, CMU_HFCORECLKEN0, CMU_HFPERCLKEN0, CMU_LFACLKEN0, CMU_LFBCLKEN0, CMU_LFAPRESC0,
CMU_LFBPRESC0, and CMU_PCNTCTRL from editing. Write the unlock code to unlock. When reading the register, bit 0 is set
when the lock is enabled.
Mode
Read Operation
UNLOCKED
LOCKED
Write Operation
LOCK
UNLOCK
2011-04-12 - d0001_Rev1.10
Value
0
1
0
0x580E
120
Description
CMU registers are unlocked
CMU registers are locked
Lock CMU registers
Unlock CMU registers
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