PCF85263ATT/AJ View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
PCF85263ATT/AJ
NXP Semiconductors.
'PCF85263ATT/AJ' PDF : 100 Pages View PDF
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
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
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
Bit 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.
PCF85263A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4.1 — 27 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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