RM0091 System window watchdog (WWDG)
Doc ID 018940 Rev 1 465/742
22.6 WWDG registers
Refer to Section 1.1 on page 34 for a list of abbreviations used in register descriptions.
The peripheral registers can be accessed by half-words (16-bit) or words (32-bit).
22.6.1 Control register (WWDG_CR)
Address offset: 0x00
Reset value: 0x0000 007F
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.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Res. Res. Res. Res. Res. Res. Res. Res. WDGA T[6:0]
rs rw
Bits 31:8 Reserved, must be kept at reset value.
Bit 7 WDGA: Activation bit
This bit is set by software and only cleared by hardware after a reset. When WDGA = 1, the
watchdog can generate a reset.
0: Watchdog disabled
1: Watchdog enabled
Bits 6:0 T[6:0]: 7-bit counter (MSB to LSB)
These bits contain the value of the watchdog counter. It is decremented every (4096 x
2
WDGTB
) PCLK cycles. A reset is produced when it rolls over from 0x40 to 0x3F (T6 becomes
cleared).
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