PCF85263ATSLASHA datasheet(16/92 Pages) NXP

16 / 92 page

NXP Semiconductors

PCF85263A

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

aaa-009581

SECONDS

100 Hz tick

MINUTES

HR_XX_XX_00

HR_XX_00_XX

HR_00_XX_XX

100TH_SECONDS

100TH

1 Hz tick

Figure 12. Data flow for the stop-watch function

7.4 Alarms

There are two independent alarms. Each is separately configured and may be used

to generate an interrupt. In RTC mode, an alarm is configured for time and date. In

stop-watch mode when the RTC is functioning as an elapsed time counter, an alarm is

configured for time only.

7.4.1 Alarms in RTC mode

In RTC mode, Alarm 1 can be configured from seconds to months. Alarm 2 operates

on minutes, hours and weekday. Each segment of the time is independently enabled.

Alarms can be output on the INTA and INTB pins.

7.4.1.1 Alarm1 and alarm2 registers in RTC mode

Setting the time for alarm1: Only the information which is relevant for the alarm condition

must to be programmed. The unused parts are ignored.

Bit positions labeled as - are not implemented.

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

RTC alarm1 registers

08h

Second_alarm1

0 to 5

0 to 9

09h

Minute_alarm1

0 to 5

0 to 9

AMPM 0 to 1 0 to 9

0Ah

Hour_alarm1

0 to 2

0 to 9

Table 12. Alarm1 and alarm2 registers in RTC mode coded in BCD (RTCM = 0)

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

16 / 92

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