PCF85363ATLSLASHAX datasheet(10/86 Pages) NXP

10 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

7.2 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

Bit positions labeled as - are not implemented and return 0 when read.

Upper-digit (ten’s place)

Digit (unit place)

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00h

100th_seconds [1]

0 to 9

01h

Seconds

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

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 PCF85363A 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.

PCF85363A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 18 June 2021

10 / 86

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