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PCF85263ATL/A 数据表(PDF) 11 Page - NXP Semiconductors |
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PCF85263ATL/A 数据表(HTML) 11 Page - NXP Semiconductors |
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11 / 92 page  NXP Semiconductors PCF85263A Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus Bit positions labeled as - are not implemented and return 0 when read. Upper-digit (ten’s place) Digit (unit place) Address Register name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00h 100th_seconds [1] 0 to 9 0 to 9 01h Seconds OS 0 to 5 0 to 9 02h Minutes EMON 0 to 5 0 to 9 AMPM 0 to 1 0 to 9 03h Hours [2] - - 0 to 2 0 to 9 04h Days [3] - - 0 to 3 0 to 9 05h Weekdays - - - - - 0 to 6 06h Months - - - 0 to 1 0 to 9 07h Years 0 to 9 0 to 9 Table 7. Time and date registers in RTC mode (RTCM = 0) [1] The 100th_seconds register is only available when the 100TH mode is enabled, see Section 7.13.1. When the 100TH mode is disabled, this register always returns 0. [2] Hour mode is set by the 12_24 bit in the Oscillator register, see Section 7.10. [3] If the year counter contains a value, which is exactly divisible by 4, the PCF85263A compensates for leap years by adding a 29th day to February. 7.2.1 Definition of BCD The Binary-Coded Decimal (BCD) is an encoding of numbers where each digit is represented by a separate bit field. Each bit field may only contain the values 0 to 9. In this way, decimal numbers and counting is implemented. Example: 59 encoded as an entire number is represented by 3Bh or 11 1011. In BCD the 5 is represented as 5h or 0101 and the 9 as 9h or 1001 which combines to 59h. Upper-digit (ten’s place) Digit (unit place) Value in decimal Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00 0 0 0 0 0 0 0 0 01 0 0 0 1 0 0 0 1 02 0 0 1 0 0 0 1 0 : : : : : : : : : 09 1 0 0 1 1 0 0 1 10 0 0 0 0 0 0 0 0 : : : : : : : : : 98 1 0 0 1 1 0 0 0 99 1 0 0 1 1 0 0 1 Table 8. BCD coding 7.2.2 OS: Oscillator stop When the oscillator of the PCF85263A is stopped, the OS status bit is set. The oscillator can be stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to PCF85263A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 5 — 1 February 2021 11 / 92 |
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