PCF2127AT datasheet(38/100 Pages) PHILIPS

38 / 100 page

PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

38 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

8.10.1 Register Second_alarm

8.10.2 Register Minute_alarm

Table 44.

Second_alarm - second alarm register (address 0Ah) bit allocation

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

Bit

Symbol

AE_S

SECOND_ALARM (0 to 59)

Reset

value

XXX

Table 45.

Second_alarm - second alarm register (address 0Ah) bit description

Bit

Symbol

Value

Place value Description

AE_S

second alarm is enabled

second alarm is disabled

6 to 4

SECOND_ALARM

0 to 5

ten’s place

second alarm information coded in BCD format

3to0

0 to9

unit place

Table 46.

Minute_alarm - minute alarm register (address 0Bh) bit allocation

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

Bit

Symbol

AE_M

MINUTE_ALARM (0 to 59)

Reset

value

XXX

Table 47.

Minute_alarm - minute alarm register (address 0Bh) bit description

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

Bit

Symbol

Value

Place value Description

AE_M

minute alarm is enabled

minute alarm is disabled

6 to 4

MINUTE_ALARM

0 to 5

ten’s place

minute alarm information coded in BCD format

3to0

0 to9

unit place

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