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PCF8564A 数据表(PDF) 35 Page - NXP Semiconductors |
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PCF8564A 数据表(HTML) 35 Page - NXP Semiconductors |
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35 / 86 page  NXP Semiconductors PCA2131 Nano-power highly accurate RTC with integrated quartz crystal for automotive applications Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and unchanged by subsequent resets. Bit Symbol Value Place value Description 6 T 0 - unused 12-hour mode[1] 0 - indicates AM 5 AMPM 1 - indicates PM 4 0 to 1 ten’s place 3 to 0 HOUR_ALARM 0 to 9 unit place hour alarm information 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 HOUR_ALARM 0 to 9 unit place hour alarm information coded in BCD format when in 24-hour mode Table 50. Hour_alarm - hour alarm register (address 10h) bit description...continued [1] Hour mode is set by the bit 12_24 in register Control_1. 7.10.4 Register Day_alarm Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and unchanged by subsequent resets. Bit 7 6 5 4 3 2 1 0 Symbol AE_D T DAY_ALARM (1 to 31) Reset value 1 0 0 0 0 0 0 0 Table 51. Day_alarm - day alarm register (address 11h) bit allocation Bits labeled as T are unused and return 0 when readBits labeled as X are undefined at power-on and unchanged by subsequent resets. Bit Symbol Value Place value Description 0 - day alarm is enabled 7 AE_D 1 - day alarm is disabled 6 T 0 - unused 5 to 4 0 to 3 ten’s place 3 to 0 DAY_ALARM 0 to 9 unit place day alarm information coded in BCD format Table 52. Day_alarm - day alarm register (address 11h) 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 35 / 86 |
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