PCF85263ATLSLASHAX datasheet(54/100 Pages) NXP

54 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

54 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

8.13 Function register

8.13.1 100TH: 100th seconds mode

[1]

Default value.

The PCF85263A can be configured to count at a resolution of 1 second or 0.01 seconds.

In 100th mode, the 100th_seconds register becomes available and the RTC counts at a

resolution of 0.01 seconds.

The 256 Hz clock signal is divided by 3 for fourteen 100 Hz periods and then by 2 for

eleven 100 Hz periods. This produces an effective division ratio of 2.56 with a maximum

jitter of 3.91 ms. Over twenty-five 100 Hz cycles the jitter is 0 ns.

8.13.2 PI[1:0]: Periodic interrupt

[1]

Default value.

The periodic interrupt mode can be used to enable pre-defined timers for generating

pulses on the interrupt pin. Interrupts once per second, once per minute or once per hour

can be generated.

When disabled, the timers are reset. When enabled, the time to the first pulse is between

the chosen period and the chosen period minus 1 seconds.

The timers are not affected by STOP.

When the periodic interrupt triggers, the PIF (PI flag) in the Flags register (Section 8.14 on

page 57) is set.

The flag does not have to be cleared to allow another INTA or INTB pulse.

The duration of the periodic interrupt is unaffected by offset calibration.

See Section 8.9 “Interrupts” for a description of interrupt pulse control and output pins.

Table 51.

Function - chip function control register (address 28h) bit description

Bit

Symbol

100TH

PI[1:0]

RTCM

STOPM

COF[2:0]

Section

Section 8.13.1

Section 8.13.2

Section 8.13.3

Section 8.13.4

Section 8.13.5

Table 52.

100TH bit - Function control register (address 28h)

Bit

Symbol

Value

Description

7100TH

100th second mode

0[1]

100th second disabled

100th second enabled

Table 53.

PI[1:0] bits - Function control register (address 28h)

Bit

Symbol

Value

Description

6 to 5

PI[1:0]

periodic interrupt

00[1]

no periodic interrupt

once per second

once per minute

once per hour

PCF85263ATL/AX Datasheet(PDF) 54 Page - NXP Semiconductors

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