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ARM DUI 0125A
© Copyright ARM Limited 1999. All rights reserved.
4-13
4.3.6 CM_LOCK (0x10000014)
The core module lock register (CM_LOCK) is a read/write register that is used to
control access to the CM_OSC register, allowing it to be locked and unlocked. This
mechanism prevents the CM_OSC register from being overwritten accidently.
Table 4-7 describes the core module lock register bits.
Table 4-7 CM_LOCK register
Bits Name Access Function
16 LOCKED Read This bit indicates if the CM_OSC register is
locked or unlocked:
0 = unlocked
1 = locked.
15:0 LOCKVAL Read/write Write the value 0x0000A05F to this register
to enable write accesses to the CM_OSC
register.
Write any other value to this register to lock
the CM_OSC register.
31 0151617
Reserved
LOCKVALLOCKED