PCF85263ATLSLASHA datasheet(15/92 Pages) NXP

15 / 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

01h

Seconds

0 to 5

0 to 9

02h

Minutes

EMON 0 to 5

0 to 9

03h

Hours_xx_xx_00 0 to 9

0 to 9

04h

Hours_xx_00_xx 0 to 9

0 to 9

05h

Hours_00_xx_xx 0 to 9

0 to 9

06h

not used

07h

not used

Table 11. Time registers in stop-watch mode (RTCM = 1)...continued

[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.

7.3.1 Setting and reading the time in stop-watch mode

Figure 12 shows the data flow and data dependencies starting from the 100 Hz clock tick.

During read operations, the time counting circuits (memory locations 00h through 07h)

are copied into an output register. The RTC continues counting in the background.

When reading or writing the time it is very important to make a read or write access in

one go, that is, setting or reading 100th_seconds through to HR_00_xx_xx should be

made in one single access. Failing to comply with this method could result in the time

becoming corrupted.

As an example, if the seconds value is set in one access and then in a following

access the minutes value is set, it is possible that the time increments between the two

accesses. A similar problem exists when reading. A roll-over may occur between reads

thus giving the seconds from one moment and the minutes from the next.

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

15 / 92

PCF85263ATL/A Datenblatt(PDF) 15 Page - NXP Semiconductors

PCF85263ATL/A Datenblatt(HTML) 15 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datenblatt Download

Link URL