RV-3049 datasheet(34/65 Pages) MICROCRYSTAL

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Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

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4.6. INTERRUPT OUTPUT INT

An active LOW Interrupt signal is available at INT pin.

The INT is an open-drain output and requires a pull-up resistor to VDD.

Interrupts may be sourced from five places:

•

Alarm function

•

Countdown Timer function

•

VLOW1 detection

•

VLOW2 detection

•

System Reset function

All Interrupt signals follow the condition of their corresponding flags in the bits 0 to 4 of register Control_INT Flag at

address 02h.

Alarm Interrupt:

Generation of Interrupts from the Alarm function is enabled via “AIE” = “1” (bit 0 in register Control_INT). If “AIE” is

enabled, the INT pin follows the condition of Flag “AF” (bit 0 in register Control_INT Flag). To clear Interrupt signal

( INT ), the corresponding flag “AF” needs to be cleared by writing = “0”, clearing “AF” will immediately clear INT .

Timer Interrupt:

Generation of Interrupts from the Countdown Timer is enabled via “TIE” = “1” (bit 1 in register Control_INT). If “TIE”

is enabled, the INT pin follows the condition of Flag “TF” (bit 1 in register Control_INT Flag). To clear Interrupt

signal ( INT ), the corresponding flag “TF” needs to be cleared by writing = “0”, clearing “TF” will immediately clear

INT .

VLOW1 Interrupt:

Generation of Interrupts from the Voltage Low 1 detection is enabled via “V1IE” = “1” (bit 2 in register Control_INT).

If “V1IE” is enabled, the INT pin follows the condition of Flag “V1IF” (bit 2 in register Control_INT Flag). To clear

Interrupt signal ( INT ), both corresponding flags “V1IF” (bit 2 in register Control_INT Flag) and “V1F” (bit 2 in

VLOW2 Interrupt:

Generation of Interrupts from the Voltage Low 2 detection is enabled via “V2IE” = “1” (bit 3 in register Control_INT).

If “V2IE” is enabled, the INT pin follows the condition of Flag “V2IF” (bit 3 in register Control_INT Flag). To clear

Interrupt signal ( INT ), both corresponding flags “V2IF” (bit 3 in register Control_INT Flag) and “V2F” (bit 3 in

System Reset Interrupt:

Generation of Interrupts from the System Reset function is enabled via “SRIE” = “1” (bit 4 in register Control_INT).

If “SRIE” is enabled, the INT pin follows the condition of Flag “SRF” (bit 4 in register Control_INT Flag). To clear

Interrupt signal ( INT ), both corresponding flags “SRF” (bit 4 in register Control_INT Flag) and “SR” (bit 4 in register

Control_Status) need to be cleared by writing = “0”.

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