NUC505-YO2Y datasheet(92/130 Pages) NUVOTON

92 / 130 page

NUC505

July. 26, 2018

Page 92 of 130

Rev.1.08

Watchdog Timer (WDT)

6.7

6.7.1

Overview

The Watchdog Timer is used to perform a system reset when system runs into an unknown state.

This prevents system from hanging for an infinite period of time. Besides, the Watchdog Timer

supports the function to wake up system from Power-down mode.

6.7.2

Features



18-bit free running up counter for Watchdog Timer time-out interval.



Selectable time-out interval (2

4 ~ 218) WDT_CLK cycle and the time-out interval period is

32.5 ms ~ 8.224 s if WDT_CLK = 32 kHz.



System kept in reset state for a period of (1 / WDT_CLK) * 63



Supports selectable Watchdog Timer reset delay period, including 1026、130 、18 or 3

WDT_CLK reset delay period.



Supports Watchdog Timer time-out wake-up function when Watchdog Timer clock source is

selected as 32 kHz low-speed oscillator.

Window Watchdog Timer (WWDT)

6.8

6.8.1

Overview

The Window Watchdog Timer is used to perform a system reset within a specified window period

to prevent software run to uncontrollable status by any unpredictable condition.

6.8.2

Features



6-bit down counter CNTDAT (WWDT_CNT[5:0]) and 6-bit compare value CMPDAT

(WWDT_CTL[21:16]) to make the window period flexible



Selectable maximum 11-bit WWDT clock prescale PSCSEL (WWDT_CTL[11:8]) to make

WWDT time-out interval variable

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