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PCF8523T 数据表(PDF) 21 Page - NXP Semiconductors |
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PCF8523T 数据表(HTML) 21 Page - NXP Semiconductors |
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21 / 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 21 of 74 NXP Semiconductors PCF8523 Real-Time Clock (RTC) and calendar 8.6.2 Register Minutes 8.6.3 Register Hours [1] Hour mode is set by bit 12_24 in register Control_1 (see Table 7). 8.6.4 Register Days [1] If the year counter contains a value, which is exactly divisible by 4 (including the year 00), the PCF8523 compensates for leap years by adding a 29th day to February. Fig 12. OS flag 013aaa319 OS = 1 and flag can not be cleared OS = 1 and flag can be cleared t VDD oscillation OS flag OS flag cleared by software OS flag set when oscillation stops oscillation now stable Table 14. Minutes - minutes register (address 04h) bit description Bit Symbol Value Place value Description 7 - - - unused 6 to 4 MINUTES 0 to 5 ten’s place actual minutes coded in BCD format 3 to 0 0 to 9 unit place Table 15. Hours - hours register (address 05h) bit description Bit Symbol Value Place value Description 7 to 6 - - - unused 12 hour mode[1] 5 AMPM 0 - indicates AM 1 - indicates PM 4 HOURS 0 to 1 ten’s place actual hours in 12 hour mode coded in BCD format 3 to 0 0 to 9 unit place 24 hour mode[1] 5 to 4 HOURS 0 to 2 ten’s place actual hours in 24 hour mode coded in BCD format 3to0 0to 9 unit place Table 16. Days - days register (address 06h) bit description Bit Symbol Value Place value Description 7 to 6 - - - unused 5to4 DAYS[1] 0 to 3 ten’s place actual day coded in BCD format 3to0 0to 9 unit place |
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