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RM0090: Reference manual - STMicroelectronics

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<strong>RM0090</strong> Window watchdog (WWDG)<br />

Table 85. Timeout values at 30 MHz (f PCLK1 )<br />

Prescaler WDGTB<br />

19.5 Debug mode<br />

Min timeout (µs)<br />

T[5:0] = 0x00<br />

Max timeout (ms)<br />

T[5:0] = 0x3F<br />

1 0 136.53 8.74<br />

2 1 273.07 17.48<br />

4 2 546.13 34.95<br />

8 3 1092.27 69.91<br />

When the microcontroller enters debug mode (Cortex-M4F core halted), the WWDG<br />

counter either continues to work normally or stops, depending on DBG_WWDG_STOP<br />

configuration bit in DBG module. For more details, refer to Section 33.16.2: Debug support<br />

for timers, watchdog, bxCAN and I2C.<br />

Doc ID 018909 Rev 3 540/1416

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