PCF8564A datasheet(26/86 Pages) NXP

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NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

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1 1

A 0

A 0 0

A P/S

SDA

SCL

slave address

address 05h

software reset 2Ch

R/W

aaa-042191

internal

reset signal

Figure 12. Software reset command

7.8.2 CPR: clear prescaler

To set the time for RTC mode, the clear prescaler instruction is needed.

Before sending this instruction, it is mandatory to first set stop by the STOP bit.

See STOP definition for an explanation on using this instruction.

7.8.3 CTS: clear timestamp

The timestamp registers (address 14h to 2Fh) can be set to all 0 with this instruction.

7.9 Time and date function

Most of these registers are coded in the Binary Coded Decimal (BCD) format.

7.9.1 Register 100th Seconds

Bit

Symbol

100TH SECONDS (0 to 99)

Reset

value

Table 25. 100th Seconds - 100th seconds (address 06h) bit allocation

Bit

Symbol

Value

Place value Description

7 to 4

0 to 9

ten’s place

3 to 0

100TH SECONDS

0 to 9

unit place

actual seconds coded in BCD format

Table 26. 100th Seconds - 100th seconds register (address 06h) bit description

PCA2131

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Product data sheet

Rev. 1.0 — 26 July 2021

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