PCF85363ATLSLASHA datasheet(15/86 Pages) NXP

15 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

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.

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 10. 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

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

PCF85363A

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Product data sheet

Rev. 3.1 — 18 June 2021

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