SM8578BV
INTERRUPT HANDLING
Alarm Interrupt
I If AIE = 1 when the alarm occurs, output INTN goes LOW. If AIE = 0, INTN is in high impedance state.
I The alarm interrupt is output when the 10s seconds digit carries over to the minutes digit.
AIE bit
INTN output
AF bit
"1"
"0"
No output while AIE is "0"
Hi−Z
LOW−level
Data 0 written to AF
"1"
"0"
Alarm interrupt
timing
Timer Interrupt
I The TI/TP bit setting selects either level interrupt mode or periodic interrupt mode output (with the AIE and
FE bits set to “0”).
(1) Level interrupt mode (TI/TP = “0”)
I If TIE = “1” when the interrupt occurs, output INTN goes LOW. If TIE = “0”, INTN is in high imped-
ance state.
TIE bit
INTN output
TF bit
No output
while TIE is "0"
Data 0 written to TF
"1"
"0"
Hi−Z
LOW−level
"1"
"0"
Timer interrupt
timing
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