SM8578BV Nippon_Precision_Circuits America, SM8578BV Datasheet - Page 9

• Manufacturer Part Number: SM8578BV
• Description: Real-time Clock ic
• Manufacturer: Nippon_Precision_Circuits America

Interrupt Operation
Interrrupt output
The INTN interrrupt output mode is determined by
the timer interrupt bit (TIE), alarm interrupt bit
(AIE), and frequency enable bit (FE), as shown in
the following table. Note that only one bit can be set
to 1.
Alarm interrupt
When AIE is 1 and an alarm event occurs, INTN out-
put goes LOW. If AIE is 0, however, INTN is in a
high-impedance state. The alarm interrupt is output
INTN output
AIE bit
AF bit
SM8578BV
Data 0 written to AF
when a carry from the seconds register to the minute
register occurs.
TIE
1
0
0
0
No output while AIE is 0
AIE
0
1
0
0
F E
0
0
1
0
NIPPON PRECISION CIRCUITS—9
Timer interrupt output
Alarm interrupt output
Frequency output
Output disabled
"1"
"0"
Alarm interrupt
timing
Hi-Z
LOW-level
"1"
"0"
M O D E