SM8578 Nippon_Precision_Circuits America, SM8578 Datasheet - Page 12

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

(2) Periodic mode (TI/TP = “1”)
* Auto-return: The auto-return time (t
I
I
If TIE = “1” when the interrupt occurs, output INTN goes LOW.
If TIE = “0” when the interrupt occurs, output INTN stays high impedance and the TF bit is set to “1”,
and this condition is maintained.
INTN output
TIE bit
TF bit
Source clock
RTN
4096Hz
1/60Hz
t
RTN
64Hz
1Hz
) is determined by the source clock set by register C.
SM8578BV
Data 0 written to TF
Auto-return time (t
0.122ms
0.122ms
7.81ms
0.5s
Auto-return
NIPPON PRECISION CIRCUITS INC.—12
RTN
)
Hi
LOW
"1"
"0"
"1"
"0"
Timer interrupt
timing
−
Z
−
level