PCF2129 datasheet(12/86 Pages) PHILIPS

12 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

12 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.2.3 Register Control_3

8.3 Register CLKOUT_ctl

Table 10.

Control_3 - control and status register 3 (address 02h) bit allocation

Bit

Symbol

PWRMNG[2:0]

BTSE

BLF

BIE

BLIE

Reset

value

000

0000

Table 11.

Control_3 - control and status register 3 (address 02h) bit description

Bit

Symbol

Value

Description

Reference

7 to 5

PWRMNG[2:0]

see

Table 19

control of the battery switch-over, battery low

detection, and extra power fail detection functions

Section 8.5

BTSE

no timestamp when battery switch-over occurs

Section 8.11.4

time-stamped when battery switch-over occurs

no battery switch-over interrupt generated

Section 8.5.1

and

Section 8.11.4

flag set when battery switch-over occurs;

flag must be cleared to clear interrupt

BLF

battery status ok;

no battery low interrupt generated

Section 8.5.2

battery status low;

flag cannot be cleared by command

BIE

no interrupt generated from the battery flag (BF)

Section 8.12.6

interrupt generated when BF is set

BLIE

no interrupt generated from battery low flag (BLF)

Section 8.12.7

interrupt generated when BLF is set

Table 12.

CLKOUT_ctl - CLKOUT control register (address 0Fh) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

TCR[1:0]

OTPR

COF[2:0]

Reset

value

000

Table 13.

CLKOUT_ctl - CLKOUT control register (address 0Fh) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

Value

Description

7 to 6

TCR[1:0]

see Table 14

temperature measurement period

OTPR

no OTP refresh

OTP refresh performed

4 to 3

unused

2 to 0

COF[2:0]

see Table 15

CLKOUT frequency selection

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