PCF85263ATLSLASHA datasheet(58/100 Pages) NXP

58 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

58 of 100

NXP Semiconductors

PCF85263A

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

8.15 Reset register

For a

• software reset (SR), 00101100 (2Ch) must be sent to register Reset (address 2Fh). A

software reset also triggers CPR and CTS

• clear prescaler (CPR), 10100100 (A4h) must be sent to register Reset (address 2Fh)

• clear timestamp (CTS),00100101 (25h) must be sent to register Reset (address 2Fh)

It is possible to combine CPR and CTS by sending 10100101 (A5h).

Remark: Any other value sent to this register is ignored.

8.15.1 SR - Software reset

A reset is automatically generated at power-on. A reset can also be initiated with the

software reset command.

The PCF85263A resets to:

Mode — real-time clock, 100th second off

Time — 00:00:00.00

Date — 2000.01.01

Weekday — Saturday

Battery switch — on, switching on the lower threshold voltage

Oscillator — CL =7pF

Pins — INTA = 32 kHz output, CLK = 32 kHz output, TS = disabled

In the reset state, all registers are set according to Table 62.

Table 61.

Reset - software reset control (address 2Fh) bit description

Bit

Symbol

CPR

CTS

Section

Section 8.15.2

Section 8.15.1

Section 8.15.3

Fig 30. Software reset command

PCF85263ATL/A Datasheet(PDF) 58 Page - NXP Semiconductors