3-WIRE REAL-TIME CLOCK
S-35190A
Rev.2.4_00
5. Minute-periodical interrupt output 2
The output of minute-periodical interrupt 2 is the function to output “L”, for 7.9 ms, from the INT 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 INT 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
INT pin
7.9 ms
7.9 ms
7.9 ms
60 s
60 s
(b) During Read in the real-time data register
(Normal minute-
carry processing)
Minute-carry processing
Minute-carry processing Minute-carry processing
INT pin
0.5 s Max.
7.9 ms
7.9 ms
60 s
7.9 ms
60 s
Serial
communication
Real-time data Real-time
Real-time data Real-time
read command data reading read command data reading
(c) During Write in the real-time data register
Minute-carry processing
Minute-carry processing
Minute-carry processing
INT pin
7.9 ms
7.9 ms
30 s
7.9 ms
55 s
80 s
10 s
45 s
50 s
Real-time data
write timing
Second data of writing: "50" s
The output period is shorter.
Second data of writing: "10" s
The output period is longer.
Figure 31 Timing of Minute-periodical Interrupt Output 2
Seiko Instruments Inc.
25
SII [ SEIKO INSTRUMENTS INC ]
