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PCF2123 Datasheet(PDF) 15 Page - NXP Semiconductors |
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PCF2123 Datasheet(HTML) 15 Page - NXP Semiconductors |
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15 / 54 page  PCF2123_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 19 November 2008 15 of 54 NXP Semiconductors PCF2123 SPI Real time clock/calendar [1] Values shown in decimal. [2] Hour mode is set by the 12_24 bit in register Control_1. [1] Values shown in decimal. [2] The RTC compensates for leap years by adding a 29th day to February if the year counter contains a value which is exactly divisible by 4, including the year 00. [1] These bits may be re-assigned by the user. [2] Values shown in decimal. [1] The weekday assignments may be re-defined by the user. Table 11. Register Hours (address 04h) bits description Bit Symbol Value Description 7 and 6 - - unused 12 hour mode[2] 5 AMPM 0 indicates AM 1 indicates PM 4 to 0 HOURS 01 to 12[1] this register holds the current hours coded in BCD format for 12 hour mode 24 hour mode[2] 5 to 0 HOURS 00 to 23[1] this register holds the current hours coded in BCD format for 24 hour mode Table 12. Register Days (address 05h) bits description Bit Symbol Value Description 7 and 6 - - unused 5 to 0 DAYS 01 to 31[1] this register holds the current day coded in BCD format[2] Table 13. Register Weekdays (address 06h) bits description Bit Symbol Value Description 7 to 3 - - unused 2to0[1] WEEKDAYS 0 to 6[2] this register holds the current weekday, see Table 14 Table 14. Weekday assignments Day[1] Upper-digit Digit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sunday X X XXX0 0 0 Monday X X XXX0 0 1 Tuesday X X XXX0 1 0 Wednesday X X XXX0 1 1 Thursday X X XXX1 0 0 Friday X XXXX1 0 1 Saturday X X XXX1 1 0 |
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