PCF85263ATSLASHAJ 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

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

Product data sheet

Rev. 5 — 1 February 2021

56 / 92

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