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AS3722 Scheda tecnica(PDF) 79 Page - ams-OSRAM AG |
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AS3722 Scheda tecnica(HTML) 79 Page - ams-OSRAM AG |
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79 / 199 page  Page 78 ams Datasheet Document Feedback [v1-01] 2015-Sep-07 AS3722 − Detailed Descriptions- System Functions to the host controller via the serial interface. Any subsequent read access to the RTCyear register will enable the update of the parallel register again. This mechanism makes sure that the maximum error of the value that is written to or read from the registers is 1 second. With the rtc_lock bit in OTP, the write access to the RTC registers can be locked and only be eabled by writing a “magic” word to the appropriate address. To start the RTC, rtc_on bit has to be set to 1. The RTC stops automatically at its highest value to prevent overrun. Alarm The RTC module includes an alarm function. When the content of the RTCAlarm registers equals the content of the RTC registers bit rtc_alarm will be set in the interrupt register. Furthermore the RTC module can generate a repeating interrupt every second, every minute, every 2 minutes or every 8 minutes. To avoid ambiguous behavior during write access to the RTCAlarm registers any write access to the RTCAlarmSecond register will disable the alarm function; any subsequent write access to the RTCAlarmyear will enable the alarm function again. |
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