PCF2129 datasheet(36/86 Pages) PHILIPS

36 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

36 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.10.1 Register Watchdg_tim_ctl

8.10.2 Register Watchdg_tim_val

Table 48.

Watchdg_tim_ctl - watchdog timer control register (address 10h) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as T must always be written with logic 0.

Bit

Symbol

WD_CD

TI_TP

TF[1:0]

Reset

value

---

Table 49.

Watchdg_tim_ctl - watchdog timer control register (address 10h) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as T must always be written with logic 0.

Bit

Symbol

Value

Description

WD_CD

watchdog timer disabled

watchdog timer enabled;

the interrupt pin INT is activated when timed out

unused

TI_TP

the interrupt pin INT is configured to generate a

permanent active signal when MSF is set

the interrupt pin INT is configured to generate a

pulsed signal when MSF flag is set (see Figure 21)

4 to 2

unused

1 to 0

TF[1:0]

timer source clock for watchdog timer

4.096 kHz

64 Hz

1 Hz

1⁄60 Hz

Table 50.

Watchdg_tim_val - watchdog timer value register (address 11h) bit allocation

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

WATCHDG_TIM_VAL[7:0]

Reset

value

XXX

Table 51.

Watchdg_tim_val - watchdog timer value register (address 11h) bit description

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

Value

Description

7to0

WATCHDG_TIM_

VAL[7:0]

00 to FF

timer period in seconds:

where n is the timer value

TimerPeriod

SourceClockFrequency

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