RM0352 datasheet(44/138 Pages) STMICROELECTRONICS

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Watchdog timer (WDG)

RM0352

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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

30 29 28 27 26 25 24

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

18 17 16

RESERVED

Part number 0

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