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About RTC with WDT | Cypress Semiconductor

About RTC with WDT

Summary: 3 Replies, Latest post by dinaline_1572371 on 28 Feb 2016 05:40 PM PST
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dinaline_1572371's picture
39 posts

Hello, I want to know how to operate RTC With WDT.


At first I use PRoc BLE with the example those name is RTC_P4_WDT example.


I found some weird thing that is about RTC.


To make exact alarm, I executed that example by modifying  Alarm Time.


first thing was modifying alarm Date ( from 04:01:30 to 02:59:59, Start time - 02:59:50).


result was malfunction routine. Alarm was not working.


compared to past experiment, second thing was modifying alarm date (from 04:01:30 to 04:01:01)


result was correctly working.


so I want to know why this result is happening.

(PS,) the result of experiment is that Between Alarm time and Time, the gap have to has more than one minutes.

mady's picture
Cypress Employee
964 posts


The Alarm can be set only in minutes level, not seconds. 

If you want it to be in seconds, then you can use the timer components to generate timer interrupts.


- Madhu Sudhan

dinaline_1572371's picture
39 posts

thank you for your reply. thanks for detailed datasheet, i could test more easily.

I wish your datasheet will be updated such as this things

- Sean

dinaline_1572371's picture
39 posts

and I want to know the sequence of the RTC. As you know, the time which is at 2:59:59 changes 04:00:00 after 1 second.

so, I wonder if RTC operates correctly in a day. and I want to know how long RTC uses, such as 2 years, 4 years .....



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