我想使用 WDT 準確一秒運算(節約電力使用)!

[Ellis]

如題所言:

因為 RTC 無法在休眠使用運算時間，所以我想使 WDT 運算 年/月/日/小時/分/秒 (這時間必須在一個月都是準的)，每一秒我會做一些運算當我運算完成之後我會休眠，讓WDT 再產生中斷喚醒累計 年/月/日/小時/分/秒 ，每次中斷我希望 MCU 能清除 WDT 或者重新再入 WDT ，我並不希望 MCU RESET 這怕會影響其他運算， 影響其他運算的準確性使得我的產品產生不可預期性錯誤，請問我該如何做這段程式會是最好，我嘗試了 Sample code WDT 部分都會 RESET 不能中斷清除讓我正常運算。

[Matt]

You may want to translate your question to English in order to get more help/feedback from this forum.

I think the main purpose of the watchdog timer (WDT) is to reset the mcu when it expires and not to use it as a timer; I may be wrong here.

What issue did you run into with the 32kHz clock again? I believe lots of folks have done the 1-second timer thing here using the RTC.

[Jimmy Wong]

首先，強烈建議請用英文發問。

I think you would like to use the WDT as the RTC in order to work as the system clock (date/time).

First, if you check on the PS of the nRF51 (as below), the WDT is required to use the LCLK (it is same as the RTC).

The difference of the WDT is only clear by ( POR Power on reset / BOR Burst out reset).

In the NRF5 series (power management), it has either system off or system on.

Here is the current consumption by using the RTC / 32KHz example.