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PCA2125 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA2125 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 40 page PCA2125_00 © NXP B.V. 2007. All rights reserved. Preliminary data sheet Rev. 00.11 — 30 January 2007 10 of 40 NXP Semiconductors PCA2125 SPI Real time clock / calendar 6.4 Time and date function The majority of these registers are coded in the Binary Coded Decimal format. BCD is used to simplify application use. An example is shown for the minutes register: [1] Hour mode is set by the 12 / 24 bit in control register 2. Table 9: BCD example Minutes value in decimal Bit 7 23 Bit 6 22 Bit 5 21 Bit 4 20 Bit 3 23 Bit 2 22 Bit 1 21 Bit 0 20 00 0000 0000 01 0000 0001 02 0000 0010 : 09 0000 1001 10 0001 0000 : 58 0101 1000 59 0101 1001 Table 10. Seconds / RF (address 02HEX) bits description Bit Symbol Value Description 7 RF 0 clock integrity is guaranteed 1 clock integrity is not guaranteed. Chip reset has occurred since flag was last cleared 6 to 0 seconds 00 to 59 this register holds the current seconds coded in BCD format; Table 11. Minutes (address 03HEX) bits description Bit Symbol Value Description 6 to 0 minutes 00 to 59 this register holds the current minutes coded in BCD format Table 12. Hours (address 04HEX) bits description Bit Symbol Value Description 12 hour mode [1] 5 AMPM 0 Indicates AM 1 Indicates PM 4 to 0 hours 00 to012 this register holds the current hours coded in BCD format for 12 hour mode 24 hour mode [1] 5 to 0 hours 00 to 23 this register holds the current hours coded in BCD format for 24 hour mode |
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