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Home/Questions/Q 2580
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nidhi singh
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nidhi singh
Asked: September 9, 20222022-09-09T10:40:23+05:30 2022-09-09T10:40:23+05:30In: Microcontroller

Renesas RA6M2 MCU RTC Issue

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Hi,

I’m using Renesas RA6M2 MCU. I’m facing following problems related to internal RTC.
1. After RTC set at morning 9 am and device put in off state. At 6 pm when we going to check RTC it shows 1 hr delay.
2. Is it need to call RTC open api at every power ON?
3. I’m using FSP3.7. In that clock source not set in rtc open api. For break this issue, I set RTC clock source after rtc open api. But After callingR_RTC_ClockSourceSet( &g_rtc_ctrl) api, I observedR_RTC->RCR2_b. launch bit is 0. In this case RTC not running.

mcura6m2renesasRenesas Microcontrollerrtc
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    1. vikas Nagpal
      2022-09-14T10:45:35+05:30Added an answer on September 14, 2022 at 10:45 am

      1. RTC time lag not exactly 1 hr. Some times it was 45 min ,15 min in 9hrs. Time lag mostly occurs in OFF state(Battery is connected). 2. In case of warm start or a hard reset (when VBATT powers RTC in case of power loss), is it need reinitialize RTC clock source? 3. When VBATT powers RTC in case ofRead more

      1. RTC time lag not exactly 1 hr. Some times it was 45 min ,15 min in 9hrs. Time lag mostly occurs in OFF state(Battery is connected).

      2. In case of warm start or a hard reset (when VBATT powers RTC in case of power loss), is it need reinitialize RTC clock source?

      3. When VBATT powers RTC in case of power loss then what is the initialization sequence of RTC after warm start or a hard reset.

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