Independent watchdog (IWDG) RM0351
1050/1693 DocID024597 Rev 3
32.4 IWDG registers
Refer to Section 1.1 on page 61 for a list of abbreviations used in register descriptions.
The peripheral registers can be accessed by half-words (16-bit) or words (32-bit).
32.4.1 Key register (IWDG_KR)
Address offset: 0x00
Reset value: 0x0000 0000 (reset by Standby mode)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
KEY[15:0]
wwwwwwwwwwwwwwww
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 KEY[15:0]: Key value (write only, read 0x0000)
These bits must be written by software at regular intervals with the key value 0xAAAA,
otherwise the watchdog generates a reset when the counter reaches 0.
Writing the key value 0x5555 to enable access to the IWDG_PR, IWDG_RLR and
IWDG_WINR registers (see Section 32.3.6: Register access protection)
Writing the key value CCCCh starts the watchdog (except if the hardware watchdog option is
selected)
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