RV-8523 Datasheet, PDF (21/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8523
9. DETAILED FUNCTIONAL DESCRIPTION
9.1. INTERRUPT
Active low interrupt signals are available at pin INT_1/CLKOUT and INT_2 . Pin INT_1/CLKOUT has both
functions of INT_1 and CLKOUT combined.
INT_1 Interrupt output may be sourced from different places:
• Second timer
• Timer A
• Timer B
• Alarm
• Battery switchover
• Battery low detection
• Clock offset correction pulse
INT_2 interrupt output is sourced only from timer B.
The control bit TAM (register Timer & CLKOUT) is used to configure whether the interrupts generated from the
second interrupt timer and timer A are pulsed signals or a permanently active signal. The control bit TBM (register
Timer & CLKOUT) is used to configure whether the interrupt generated from timer B is a pulsed signal or a
permanently active signal. All the other interrupt sources generate a permanently active interrupt signal, which
follows the status of the corresponding flags.
• The flags SF, CTAF, CTBF, AF and BSF can be cleared by using the interface
• WTAF is read only. A read of the register Control 2 (01h) will automatically resets WTAF (WTAF = 0) and
clear the interrupt
• The flag BLF is read only. It is cleared automatically from the battery low detection circuit when the battery
is replaced
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