Window watchdog (WWDG) RM0090
716/1749 RM0090 Rev 18
As an example, let us assume APB1 frequency is equal to 24 MHz, WDGTB[1:0] is set to 3
and T[5:0] is set to 63:
Refer to Table 109 for the minimum and maximum values of the t
WWDG
.
22.5 Debug mode
When the microcontroller enters debug mode (Cortex
®
-M4 with FPU core halted), the
WWDG counter either continues to work normally or stops, depending on
DBG_WWDG_STOP configuration bit in DBG module. For more details, refer to
Section 38.16.2: Debug support for timers, watchdog, bxCAN and I
2
C.
Table 109. Minimum and maximum timeout values at 30 MHz (f
PCLK1
)
Prescaler WDGTB
Min timeout (µs)
T[5:0] = 0x00
Max timeout (ms)
T[5:0] = 0x3F
1 0 136.53 8.74
2 1 273.07 17.48
4 2 546.13 34.95
8 3 1092.27 69.91
t
WWDG
1 24000⁄ 4096× 2
3
× 63 1+()× 21.85ms==
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