Datasheet

Watchdog timer (WDG) RM0352
44/138 DocID024647 Rev 1
7.2.7 Watchdog lock register WDT_LOCK
Use of this register allows write access to all other registers to be disabled. This is to
prevent rogue software from disabling the watchdog functionality. Writing a value of
0x1ACCE551 will enable write access to all other registers; writing any other value will
disable write accesses. A read from this register will return only the least significant bit:
• 0x0 indicates that write access is enabled (not locked)
• 0x1 indicates that write access is disabled (locked).
Table 40 shows the bit assignment of the WDT_LOCK register.
Table 39. Watchdog lock register WDT_LOCK
7.2.8 Watchdog peripheral identification register WDTPeriphID0-3
The WDTPeriphID0-3 registers are four 8-bit registers, that span the address location
0xFE0 to 0xFEC. The registers are read-only.
Table 41. Watchdog peripheral identification register WDTPeriphID0-3 - part 1
WDT_LOCK (WDT Base + 0xC00) Reset value: 0x0000_0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
LOCKVAL
R/W
Table 40. WDT_LOCK register bit fields
Bit field Function
LOCKVAL
Watchdog lock value
When read, returns the lock status:
0x0: write access to all watchdog other registers is enabled (default).
0x1: write access to all watchdog other registers is disabled.
When written, allows to enable or disable write access to all other watchdog registers:
Writing 0x1ACCE551: Write access to all other registers is enabled. Writing any other value: Write
access to all other registers is disabled.
WDTPeriphID0 (WDT Base + 0xFE0) Reset value: 0x0000_0005
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESERVED Part number 0
RR