PSoC wake up from sleep and executing interrupt at 1 second

[GeMo_285911]

Hello,

   

  I would like to ask if there is a possibility of waking up the PSoC from sleep using an interrupt (internal) every one second? I am interested if it is possible to do this without counting milliseconds. I used the SleepTimer, but, unfortunately, it generates an interrupt every 1024ms.

   

  Thank you!

   

George

[Bob_Marlowe]

To do that precisely you'll need a 32kHz crystal which can be configured as the source for wake-up from sleep.

   

Look into the "System Reference Guide" accessible from Creator's help-menu.

       

Bob

[GeMo_285911]

Hello,

   

  I am trying to use the RTC to wake the PSoC up every one second, but I am missing something. The RTC_EverySecondHandler() should toggle a LED but it fails to do so. Could you please, help me with this?

   

  I attached the project.

   

Regards,

   

George

[ETRO_SSN583]

Here is a series of projects with wakeup that you can look at -

       

http://www.cypress.com/forum/psoc-3-known-problems-and-solutions/psoc-3-sleep-mode-projects-various-...

       

http://www.cypress.com/resource-types/video/entering-sleep-mode-and-wakeup-using-rtc-psoc35

       

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CEMQFjAFahUKEwihz5OL2vjHAhXL0YA...

   

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0CDwQFjAEahUKEwihz5OL2vjHAhXL0YA...

       

Regards, Dana.

[GeMo_285911]

A simple question, just to be sure. The RTC only works when a 32kHz EXTERNAL crystal attached?

   

Thank you,

   

George

[ETRO_SSN583 · Accepted solution]

From the datasheet (component) -

       

General Description

   

The Real-Time Clock (RTC) component provides accurate time and date information for the
system. The time and date are updated every second based on a one pulse per second interrupt
from a 32.768-kHz crystal. Clock accuracy is based on the crystal provided and is typically
20 ppm.
 

   

Regards, Dana.

[ETRO_SSN583]

Clock config info -

       

http://www.cypress.com/documentation/application-notes/an54439-psoc-3-and-psoc-5lp-external-crystal-...     PSoC® 3 and PSoC 5LP Clocking Resources

       

http://www.cypress.com/documentation/application-notes/an60631-psoc-3-and-psoc-5lp-clocking-resource...

       

Regards, Dana.

[GeMo_285911]

Thank you! I know that there is an internal 32kHz clock and the possibility of adding an external ctystal. There is no clear statement made in the documents that the RTC only works with the external one. That was my doubt.

   

Regards,

   

George