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kobol-wiki/docs/helios64/rtc.md

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Some cleanup
2020-04-15 22:41:48 +08:00
# Real Time Clock (RTC)
Update Hardware RTC page
2020-04-15 19:00:27 +08:00
Helios64 has an on-board RTC clock which is provided by the Power Management IC (PMIC) RK808-D. The RTC functions provided by the PMIC include second/minute/hour/day/month/year information, alarm wake up as well as time calibration.
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Update Hardware RTC page
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![RTC](/helios64/img/rtc/rtc_diagram.jpg)
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Update Hardware RTC page
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The SoC receive clock signal from the PMIC RTC and in the meantime access the PMIC RTC functions over I2C bus.
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Update Hardware RTC page
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## RTC Battery
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Update Hardware RTC page
2020-04-15 19:00:27 +08:00
To save time information and allow the RTC to keep running while system is powered off, the PMIC RTC relies on a dedicated coin battery located at BAT1. The battery holder (BAT1) accepts CR1225 battery model.
![RTC Battery](/helios64/img/rtc/rtc_battery.jpg)
!!! Note
The polarity of the battery holder is indicated on the PCB with **'+'** signs.
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