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PCF2127AT/1 数据表(PDF) 44 Page - NXP Semiconductors |
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PCF2127AT/1 数据表(HTML) 44 Page - NXP Semiconductors |
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44 / 80 page  PCF2127A_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 7 May 2010 44 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.12.4 Dependency between Battery switch-over and timestamp The timestamp function depends on the control bit BTSE in register Control_3: [1] Default value. Table 52. 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 [1] 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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