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PCF8564A 数据表(PDF) 29 Page - NXP Semiconductors |
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PCF8564A 数据表(HTML) 29 Page - NXP Semiconductors |
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29 / 86 page  NXP Semiconductors PCA2131 Nano-power highly accurate RTC with integrated quartz crystal for automotive applications Bits labeled as T are unused and return 0 when read Bit Symbol Value Place value Description 4 0 to 1 ten’s place 3 to 0 HOURS 0 to 9 unit place actual hours coded in BCD format when in 12-hour mode 24-hour mode[1] 5 to 4 0 to 2 ten’s place 3 to 0 HOURS 0 to 9 unit place actual hours coded in BCD format when in 24-hour mode Table 34. Hours - hours register (address 09h) bit description...continued [1] Hour mode is set by the bit 12_24 in register Control_1 (see Table 6). 7.9.5 Register Days Bits labeled as T are unused and return 0 when read Bit 7 6 5 4 3 2 1 0 Symbol T T DAYS (1 to 31) Reset value 0 0 0 0 0 0 0 0 Table 35. Days - days register (address 0Ah) bit allocation Bit Symbol Value Place value Description 7 to 6 T 00 - unused 5 to 4 0 to 3 ten’s place 3 to 0 DAYS[1] 0 to 9 unit place actual day coded in BCD format Table 36. Days - days register (address 0Ah) bit description [1] If the year counter contains a value which is exactly divisible by 4, excluding the year 00, the RTC compensates for leap years by adding a 29th day to February. Note that next time the year will roll over to 00 will be year 2100, which is not going to be leap year. 7.9.6 Register Weekdays Bits labeled as T are unused and return 0 when read Bit 7 6 5 4 3 2 1 0 Symbol T T T T T WEEKDAYS (0 to 6) Reset value 0 0 0 0 0 0 0 1 Table 37. Weekdays - weekdays register (address 0Bh) bit allocation Bits labeled as T are unused and return 0 when read Bit Symbol Value Description 7 to 3 T 000 unused 2 to 0 WEEKDAYS 0 to 6 actual weekday value, see Table 39 Table 38. Weekdays - weekdays register (address 0Bh) bit description PCA2131 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 1.0 — 26 July 2021 29 / 86 |
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