SM8578 Nippon_Precision_Circuits America, SM8578 Datasheet - Page 11

• Manufacturer Part Number: SM8578
• Description: Real-time Clock IC
• Manufacturer: Nippon_Precision_Circuits America

INTERRUPT HANDLING
Alarm Interrupt
I
I
Timer Interrupt
I
(1) Level interrupt mode (TI/TP = “0”)
If AIE = 1 when the alarm occurs, output INTN goes LOW. If AIE = 0, INTN is in high impedance state.
The alarm interrupt is output when the 10s seconds digit carries over to the minutes digit.
The TI/TP bit setting selects either level interrupt mode or periodic interrupt mode output (with the AIE and
FE bits set to “0”).
I
If TIE = “1” when the interrupt occurs, output INTN goes LOW. If TIE = “0”, INTN is in high imped-
ance state.
INTN output
INTN output
TIE bit
AIE bit
TF bit
AF bit
SM8578BV
Data 0 written to AF
Data 0 written to TF
No output while AIE is "0"
No output
while TIE is "0"
NIPPON PRECISION CIRCUITS INC.—11
"1"
"0"
Hi−Z
LOW−level
"1"
"0"
Alarm interrupt
timing
"1"
"0"
Hi−Z
LOW−level
"1"
"0"
Timer interrupt
timing