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PCF8523T/1 数据表(PDF) 11 Page - NXP Semiconductors |
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PCF8523T/1 数据表(HTML) 11 Page - NXP Semiconductors |
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11 / 75 page  PCF8523 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 5 July 2012 11 of 74 NXP Semiconductors PCF8523 Real-Time Clock (RTC) and calendar 8.2.3 Register Control_3 [1] Default value is 111. [2] Default value. Table 9. Control_3 - control and status register 3 (address 02h) bit description Bit Symbol Value Description 7 to 5 PM[2:0] see Table 11[1] battery switch-over and battery low detection control 4 - - unused 3 BSF 0[2] no battery switch-over interrupt generated 1 flag set when battery switch-over occurs; flag must be cleared to clear interrupt 2BLF 0[2] battery status ok 1 battery status low; flag is read-only 1 BSIE 0[2] no interrupt generated from battery switch-over flag, BSF 1 interrupt generated when BSF is set 0BLIE 0[2] no interrupt generated from battery low flag, BLF 1 interrupt generated when BLF is set |
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