LM3S1911-IRN20-A0T Luminary Micro, Inc., LM3S1911-IRN20-A0T Datasheet - Page 239

• Manufacturer Part Number: LM3S1911-IRN20-A0T
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

Watchdog Lock (WDTLOCK)
Base 0x4000.0000
Offset 0xC00
Type R/W, reset 0x0000.0000
October 09, 2007
Reset
Reset
Type
Type
Bit/Field
31:0
R/W
R/W
31
15
0
0
Register 8: Watchdog Lock (WDTLOCK), offset 0xC00
Writing 0x1ACC.E551 to the WDTLOCK register enables write access to all other registers. Writing
any other value to the WDTLOCK register re-enables the locked state for register writes to all the
other registers. Reading the WDTLOCK register returns the lock status rather than the 32-bit value
written. Therefore, when write accesses are disabled, reading the WDTLOCK register returns
0x0000.0001 (when locked; otherwise, the returned value is 0x0000.0000 (unlocked)).
R/W
R/W
30
14
0
0
WDTLock
Name
R/W
R/W
29
13
0
0
R/W
R/W
28
12
0
0
R/W
R/W
Type
27
11
R/W
0
0
R/W
R/W
26
10
0
0
0x0000
Reset
R/W
R/W
25
0
9
0
Preliminary
Description
Watchdog Lock
A write of the value 0x1ACC.E551 unlocks the watchdog registers for
write access. A write of any other value reapplies the lock, preventing
any register updates.
A read of this register returns the following values:
R/W
R/W
0x0000.0001
0x0000.0000
24
0
8
0
WDTLock
WDTLock
Value
R/W
R/W
23
0
7
0
Description
Locked
Unlocked
R/W
R/W
22
0
6
0
R/W
R/W
21
0
5
0
R/W
R/W
20
0
4
0
LM3S1911 Microcontroller
R/W
R/W
19
0
3
0
R/W
R/W
18
0
2
0
R/W
R/W
17
0
1
0
R/W
R/W
16
0
0
0
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