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PCF2127AT/1 数据表(PDF) 29 Page - NXP Semiconductors |
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PCF2127AT/1 数据表(HTML) 29 Page - NXP Semiconductors |
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29 / 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 29 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.9.3 Register Hours [1] Hour mode is set by the bit 12_24 in register Control_1. 8.9.4 Register Days [1] 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. 8.9.5 Register Weekdays Although the association of the weekdays counter to the actual weekday is arbitrary, the PCF2127A will assume Sunday is 000 and Monday is 001 for the purposes of determining the increment for calendar weeks. [1] These bits may be re-assigned by the user. Table 22. Hours - hours register (address 05h) bit description Bit Symbol Value Place value Description 7to6 - - - unused 12 hour mode[1] 5 AMPM 0 - indicates AM 1 - indicates PM 4 HOURS 0 to 1 ten’s place actual hours coded in BCD format when in 12 hour mode 3to0 0to9 unit place 24 hour mode[1] 5 to 4 HOURS 0 to 2 ten’s place actual hours coded in BCD format when in 24 hour mode 3to0 0to9 unit place Table 23. Days - days register (address 06h) bit description Bit Symbol Value Place value Description 7to6 - - - unused 5to4 DAYS[1] 0 to 3 ten’s place actual day coded in BCD format 3to0 0to9 unit place Table 24. Weekdays - weekdays register (address 07h) bit description Bit Symbol Value Description 7to3 - - unused 2 to 0 WEEKDAYS 0 to 6 actual weekday value, see Table 25 Table 25. Weekday assignments Day[1] Bit 2 1 0 Sunday 0 0 0 Monday 0 0 1 Tuesday 0 1 0 Wednesday 0 1 1 Thursday 1 0 0 Friday 1 0 1 Saturday 110 |
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