本帖最后由 tyw 于 2022-10-8 16:47 编辑
5.13 Watchdog Timer (WDT)5.13.1 OverviewThe purpose of Watchdog Timer (WDT) is to perform a system reset when system runs into an unknown state. This prevents system from hanging for an infinite period of time. Besides, this Watchdog Timer supports the function to wake-up system from Idle/Power-down mode.5.13.2 Features 18-bit free running up counter for WDT time-out interval Selectable time-out interval (24~ 218) and the time-out interval is 0.48828125 ms ~ 8 s if WDT_CLK = 32.768 kHz System kept in reset state for a period of (1 / WDT_CLK) * 63 NUC970Feb. 23, 2016 Page 55 of 96 Rev 1.31NUC970 SERIES DATASHEET Supports selectable WDT reset delay period, including 1026、130、18 or 3 WDT_CLK reset delay period Supports to force WDT enabled after chip powered on or reset by setting WDTON in PWRON register Supports WDT time-out wake-up function only if WDT clock source is selected as 32 kHz
5.13看门狗定时器(WDT)
5.13.1概述当系统运行到未知状态时,看门狗计时器的目的是执行系统复位。这可以防止系统无限期挂起。此外,该看门狗定时器支持从空闲/断电模式唤醒系统的功能。
5.13.2功能 WDT超时间隔的18位自由运行计数器 如果WDT_CLK=32.768 kHz,则可选择超时间隔(24~218),超时间隔为0.48828125 ms~8 s 系统保持重置状态的时间为(1/WDT_CLK)*63 NUC970Feb。2016年23月第55页,共96页修订版1.31NUC970系列数据表 支持可选的WDT复位延迟期,包括1026、130、18或3 WDT_CLK复位延迟期 支持在芯片上电或通过在PWRON寄存器中设置WDTON重置后强制启用WDT 仅当WDT时钟源选择为32 kHz时,才支持WDT超时唤醒功能
|