PCF85263ATLSLASHA datasheet(56/92 Pages) NXP

56 / 92 page

NXP Semiconductors

PCF85263A

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

7.15.3 CTS: clear timestamp

The timestamp registers (address 11h to 22h) can be set to all 0 with this instruction.

7.16 Stop_enable register

Bit

Symbol

Value

Description

0000 000

not used

STOP bit

0 [1]

RTC clock runs

7 to 1

STOP

RTC clock is stopped

Table 62. Stop_enable - control of STOP bit (address 2Eh)

[1]

Default value.

The STOP bit stops the time from counting in both RTC mode and stop-watch mode. For

RTC mode STOP is useful to set the time accurately. For stop-watch mode it is the start/

stop control for the watch.

The counter can also be controlled from the TS pin by configuring STOPM in the

Function register (Section 7.13). The internal stop signal is a combination of STOP and

the TS pin state.

STOP bit

TS pin [1] [2]

stop signal

Counter

stopped

running

Table 63. Counter stop signal

[1]

Requires STOPM and TSPM[1:0] to be configured.

[2]

TSL = 0 (active HIGH) (Pin_IO register, address 27h).

aaa-010477

OSCILLATOR

OSCILLATOR STOP

DETECTOR

setting the OS flag

div 4

32768 Hz

8192 Hz

stop(1)

PRESCALER

RESET

100 Hz tick

1 Hz tick

CPR

1. stop is a combination of STOP register bit and the TS pin when programmed for stop control.

Figure 32. CPR and STOP bit functional diagram

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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PCF85263ATL/A Datasheet(PDF) 56 Page - NXP Semiconductors

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