RV-3049 datasheet(16/65 Pages) MICROCRYSTAL

16 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

16/65

3.4. ALARM PAGE REGISTER FUNCTION

The Alarm Page registers contain alarm information. When one or more of these registers are loaded with a valid

second, minute, hour, day, weekday, month or year information and its corresponding alarm enable bit (AE_x) is

logic “1”, then that information will be compared with the current time / date information in the Watch Page

registers.

When all enabled comparisons first match (wired “AND”) and the AIE Flag (bit 0 in register Control_INT) is enabled,

then the AF Flag (bit 0 in register Control_INT) is set = “1” and an Interrupt signal becomes available at INT pin.

Disabled Alarm registers which have their corresponding bit AE_X at logic “0” are ignored.

3.4.1.SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS ALARM REGISTER

Alarm Seconds (address 10h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

10h

Second Alarm

AE_S

Bit

Symbol

Value

Description

AE_S

Second Alarm is disabled

Second Alarm is enabled

6 to 0

Seconds Alarm

0 to 59

These bits hold the Second Alarm information coded in BCD format

Alarm Minutes (address 11h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

11h

Minute Alarm

AE_M

Bit

Symbol

Value

Description

AE_M

Minute Alarm is disabled

Minute Alarm is enabled

6 to 0

Minutes Alarm

0 to 59

These bits hold the Minute Alarm information coded in BCD format

Alarm Hours (address 12h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

12h

Hours Alarm

AE_H

20-PM

Bit

Symbol

Value

Description

AE_H

Hour Alarm is disabled

Hour Alarm is enabled

Unused

12 hour mode (AM/PM)

20-PM

Indicates AM

Indicates PM

4 to 0

Hours Alarm

1 to 12

These registers hold the Hours Alarm information coded in BCD format

when in 12 hour mode

24 hour mode

5 to 0

Hours Alarm

0 to 23

These registers hold the Hours Alarm information coded in BCD format

when in 24 hour mode

RV-3049 Datasheet(PDF) 16 Page - MICORO CRYSTAL SWITZERLAND

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