RV-3049 datasheet(33/65 Pages) MICROCRYSTAL

33 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

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4.5.1.ALARM INTERRUPT

The generation of Interrupts from the Alarm function is enabled by “AIE” = “1” (bit 0 in register Control_INT).

When all enabled Alarm comparisons first match (wired “AND”) and the Alarm Interrupt is enabled by, the Alarm

Flag “AF” (bit 0 in Register Control_INT Flag) is set to logic = “1”. The Interrupt signal ( INT ) follows the condition of

“AF”.

The Interrupt signal INT follows the condition of Alarm Flag “AF” (bit 0 in register Control_INT Flag), The Alarm

Flag “AF” and the Interrupt signal ( INT ) remain set until cleared by software writing “AF” = “0”.

Once bit “AF” has been cleared, it will only be set again when the time increments and matches the alarm condition

once more.

Alarm Interrupt Control (addresses 01h / 02h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

01h

Control_INT

SRIE

V2IE

V1IE

TIE

AIE

AF is disabled, no Alarm Interrupt generated

AF is enabled, AF is set “1”and Alarm Interrupt generated when all

enabled Alarm comparisons first match

02h

Control_INT Flag

SRF

V2IF

V1IF

No Alarm Interrupt generated

Alarm Flag is set “1” when all enabled Alarm comparisons first match,

needs to be cleared to clear INT

Bit positions labelled as “X” are not implemented and will return a “0” when read.

Example for Alarm Flag and Alarm INT

Example where “Minute Alarm” is enabled and set to 45 and no other Alarm is enabled.

If bit AIE is enabled, the INT pin follows the condition of bit 0 “AF” in register Control_INT Flag at address 02h.

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