S-35399A03 Datasheet, PDF (26/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.1.0_00
5. Minute-periodical interrupt output 2 (only in the INT1 pin output mode)
The output of minute-periodical interrupt 2 is the function to output “L”, for 7.9 ms, from the INT1 pin, synchronizing with
the first minute-carry processing after selecting the output mode. However, in Read in the real-time data register, the
procedure delays at max. 0.5 sec thus output “L” from the INT1 pin also delays at max. 0.5 sec. In Write in the real-time
data register, some delay is made in the output period due to Write timing and the second-data during Write.
(a) During normal operation
Minute-carry processing
Minute-carry processing
Minute-carry processing
INT1 pin
7.9 ms
60 s
7.9 ms
60 s
7.9 ms
(b) During real-time data read
Minute-carry processing
(Normal minute-
carry processing) _{Minute-carry processing Minute-carry processing}
INT1 pin
7.9 ms
Serial
communication
0.5 s Max.
60 s
7.9 ms
60 s
7.9 ms
Real-time data Real-time Real-time data Real-time
read command data reading read command data reading
(c) During real-time data write
Minute-carry processing
Minute-carry processing
Minute-carry processing
INT1 pin
7.9 ms
Real-time data
write timing
55 s
45 s
10 s
Second data of writing: "50" s
7.9 ms
30 s
80 s
50 s
Second data of writing: "10" s
The output period is shorter.
The output period is longer.
Figure 29 Timing of Minute-periodical Interrupt Output 2
26
Seiko Instruments Inc.
7.9 ms