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Cortex-M3 Processor Registers
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2.7.1.37 LSR Register (Offset = FB4h) [reset = X]
LSR is shown in Figure 2-40 and described in Table 2-63.
Lock Status Use this register to enable write accesses to the Control Register.
Figure 2-40. LSR Register
31 30 29 28 27 26 25 24
RESERVED
R-X
23 22 21 20 19 18 17 16
RESERVED
R-X
15 14 13 12 11 10 9 8
RESERVED
R-X
7 6 5 4 3 2 1 0
RESERVED BYTEACC ACCESS PRESENT
R-X R-X R-1h R-1h
Table 2-63. LSR Register Field Descriptions
Bit Field Type Reset Description
31-3 RESERVED R X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
2 BYTEACC R X
Reads 0 which means 8-bit lock access is not be implemented.
1 ACCESS R 1h
Write access to component is blocked. All writes are ignored, reads
are permitted.
0 PRESENT R 1h
Indicates that a lock mechanism exists for this component.
90
SWCU117A–February 2015–Revised March 2015
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