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PCF2129AT データシート(PDF) 36 Page - NXP Semiconductors |
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PCF2129AT データシート(HTML) 36 Page - NXP Semiconductors |
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36 / 68 page  PCF2129A_1 © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 01 — 13 January 2010 36 of 68 NXP Semiconductors PCF2129A Integrated RTC, TCXO and quartz crystal 8.11.4 Dependency between Battery switch-over and timestamp The timestamp function depends on the control bit BTSE in register Control_3: [1] Default value. Table 44. Battery switch-over and timestamp BTSE BF Description 0- [1] the battery switch-over does not affect the timestamp registers 1 If a battery switch-over event occurs: 0 the timestamp registers store the time and date when the switch-over occurs; after this event occurred BF is set logic 1 1 the timestamp registers are not modified; in this condition subsequent battery switch-over events or falling edges on pin TS are not registered |
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