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PCF85263ATL/A Datasheet(PDF) 14 Page - NXP Semiconductors |
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PCF85263ATL/A Datasheet(HTML) 14 Page - NXP Semiconductors |
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14 / 100 page  PCF85263A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4.1 — 27 November 2015 14 of 100 NXP Semiconductors PCF85263A Tiny RTC with alarm, battery switch-over, and I2C-bus 8.2 RTC mode time and date registers RTC mode is enabled by setting RTCM = 0. These registers are coded in the BCD format to simplify application use. Default state is: Time — 00:00:00.00 Date — 2000 01 01 Weekday — Saturday Monitor bits — OS = 1, EMON = 0 [1] The 100th_seconds register is only available when the 100TH mode is enabled, see Section 8.13.1. 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 8.10 on page 42. [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. 8.2.1 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 111011. In BCD the 5 is represented as 5h or 0101 and the 9 as 9h or 1001 which combines to 59h. Table 8. Time and date registers in RTC mode (RTCM = 0) Bit positions labeled as - are not implemented and return 0 when read. Address Register name Upper-digit (ten’s place) Digit (unit place) 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 03h Hours[2] - - AMPM 0 to 1 0 to 9 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 |
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