PCF85263ATSLASHA datasheet(26/92 Pages) NXP

26 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

Timestamps work in both RTC and stop-watch mode. During battery operation, the

mechanical switch detector may also be used to trigger the timestamp.

The timestamp registers are read only and cannot be written. It is possible to set all three

registers to 0 with the CTS instruction in the Resets register (Section 7.15).

timer registers

RTC mode

seconds

minutes

years

stopwatch mode

seconds

minutes

999999 hours

timestamp

TSR1

timestamp

TSR2

timestamp

TSR3

TS pin

battery

switchover

mode

TSR1M[1:0]

mode

TSR2M[2:0]

mode

TSR3M[1:0]

flag

TSR1F

flag

TSR2F

flag

TSR3F

load

aaa-009595

Figure 17. Timestamp

The mode for each register is controlled by the TSR_mode register.

Bit

Symbol

Value

Description

Timestamp3 (TSR3)

timestamp register 3 mode

00 [1]

no timestamp

FB, record

First time switch to Battery event

LB, record

Last time switch to Battery event

7 to 6

TSR3M[1:0]

LV, record

Last time switch to VDD event

not used

Timestamp2 (TSR2)

timestamp register 2 mode

000 [1]

no timestamp

001

FB, record

First time switch to Battery event

4 to 2

TSR2M[2:0]

010

LB, record

Last time switch to Battery event

Table 19. TSR_mode - timestamp mode control register (address 23h) bit

description

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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