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PowerDown & RTC interrupt

Question asked by Dong-gi on Apr 14, 2016
Latest reply on Apr 25, 2016 by Dong-gi

Hello

 

My boards use PowerDown & RTC function on ADuC848.

RTC is configured every 30 minute interrupt.

My boards outputs the value measured after RTC Wake up in every 30 minutes, and repeat mode to enter into PowerDown.

By the way, the error of the time which is output every 30 minutes.

I found symptoms reduced RTC time by about 0.2seconds when the output log, like <output log>

 

<output log> hour: minute : second

 

01:00:00 1000 ppm

01:30:00 1000 ppm

02:00:00 1000 ppm

02:30:00 1000 ppm

 

02:59:59 1000 ppm   <1 second reduced>.

03:29:59 1000 ppm

03:59:59 1000 ppm

04:29:59 1000 ppm

 

04:59:58 1000 ppm   <1 second reduced>.

05:29:58 1000 ppm

05:59:58 1000 ppm

06:29:58 1000 ppm

 

Why wonder whether it is time for each one to four times to output that is not exactly short.

Is due to difference speed of measure on mcu after wake up by RTC(interrupt)?

 

Regards,

dg.

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