There are eight kinds of timeout intervals provided in the WDT controller. Also, the WDT controller has multiple clock sources including 10 kHz and HCLK/2048.

The following table shows the formula of WDT timeout intervals with 10 kHz and HCLK/2048 clock sources.

Level	Timeout interval	WDT_CLK = 10 kHz	WDT_CLK = HCLK/2048
0	2⁴ × T_{WDT_CLK}	2⁴ × 100μs = 1.6 ms	2⁴ × (2048/HCLK)
1	2⁶ × T_{WDT_CLK}	2⁶ × 100μs = 6.4 ms	2⁶ × (2048/HCLK)
2	2⁸ × T_{WDT_CLK}	2⁸ × 100μs = 25.6 ms	2⁸ × (2048/HCLK)
3	2¹⁰ × T_{WDT_CLK}	2¹⁰ × 100μs = 102.4 ms	2¹⁰ × (2048/HCLK)
4	2¹² × T_{WDT_CLK}	2¹² × 100μs = 408.6 ms	2¹² × (2048/HCLK)
5	2¹⁴ × T_{WDT_CLK}	2¹⁴ × 100μs = 1.6384 s	2¹⁴ × (2048/HCLK)
6	2¹⁶ × T_{WDT_CLK}	2¹⁶ × 100μs = 6.5536 s	2¹⁶ × (2048/HCLK)
7	2¹⁸ × T_{WDT_CLK}	2¹⁸ × 100μs = 26.2144 s	2¹⁸ × (2048/HCLK)

WDT_CLK is the clock source of WDT controller:

T_{WDT_CLK} = 1 / WDT_CLK

Products:	Microcontrollers ,Arm Cortex-M0 MCUs ,M051 Base Series ,M0518 Series ,Mini51 Base Series ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC029 Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC131/NUC1311 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series
Applications:
Function:	Peripherals,Timer and PWM,Watchdog Timer (WDT)

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How many kinds of timeout intervals can be chosen in the Watchdog Timer (WDT) controller? Issue Date：2015-02-09

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