SM8578BV 데이터 시트보기 (PDF) - Nippon Precision Circuits

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SM8578BV

Real-time Clock IC

Nippon Precision Circuits  

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

NIPPON PRECISION CIRCUITS INC.—11

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