Chapter 18 Real-Time Counter With Calendar (RTCV2)
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the variation in the RTC clock output and determine the correct calibration point. Refer to Device spec for
more information on timer channel connection.
18.6.2 RTC compensation
To reach the high precision RTC clock, the compensation need following steps.
•
Characterization of the OSCCLK or OSCCLK_32K crystal, get the lookup table for the crystal
frequency versus to temperature. This step is just required one time per crystal type.
•
Perform the RTC calibration at production for each device, get the base frequency offset.
•
Perform the RTC compensation periodically after enabling the RTC.
— Measure the external temperature
— Lookup compensation value in lookup table
— Load the compensation value into RTC
Содержание MC9S12ZVHL32
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Страница 788: ...Appendix A MCU Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 788 Freescale Semiconductor...
Страница 794: ...Appendix B ADC Electricals S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 794 Freescale Semiconductor...
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Страница 802: ...Appendix F MSCAN Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 802 Freescale Semiconductor...
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Страница 810: ...Appendix H BATS Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 810 Freescale Semiconductor...
Страница 816: ...Appendix K OSC32K Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 816 Freescale Semiconductor...
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