s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 29

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.0
5. Minute-periodical interrupt output 2 (only in the
communication
The output of minute-periodical interrupt 2 is the function to output “L”, for 7.9 ms, from the
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
data register, some delay is made in the output period due to Write timing and the second-data during Write.
(a) During normal operation
(b) During real-time data read
(c) During real-time data write
Real-time data
INT1 pin
_00
write timing
Serial
INT1 pin
INT1 pin
read command
Real-time data
Minute-carry processing
7.9 ms
Minute-carry processing
Minute-carry processing
7.9 ms
7.9 ms
Figure 35 Timing of Minute-periodical Interrupt Output 2
Second data of writing: "50" s
Real-time
data reading
The output period is shorter.
45 s
60 s
carry processing)
55 s
Seiko Instruments Inc.
60 s
(Normal minute-
0.5 s Max.
Real-time data
read command
Minute-carry processing
Minute-carry processing
10 s
INT
INT
1
Minute-carry processing
Real-time
data reading
1
pin also delays at max. 0.5 sec. In Write in the real-time
pin output mode)
Second data of writing: "10" s
30 s
7.9 ms
7.9 ms
The output period is longer.
7.9 ms
60 s
60 s
2-WIRE REAL-TIME CLOCK
80 s
Minute-carry processing
50 s
Minute-carry processing
Minute-carry processing
INT
1
pin, synchronizing with
7.9 ms
S-35399A02
7.9 ms
7.9 ms
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