3-WIRE REAL-TIME CLOCK
S-35190A
Rev.2.4_00
(4) INT register 1 access and INT register 2 access
In Read/Write the INT register 1, data varies depending on the setting of the status register 2. Be sure to Read/Write
the INT register 1 after setting the status register 2. When setting the alarm by using the status register 2, these
registers work as 3-byte alarm time data registers, in other statuses, they work as 1-byte registers. When outputting
the user-set frequency, they are the data registers to set up the frequency.
Read/Write the INT register 2 after setting INT2AE in the status register 2. When INT2AE is in “1”, the INT register 2
works as for setting the 3-byte alarm time data. The INT register 2 does not have the function to output the user-set
frequency. Regarding details of each data, refer to “4. INT register 1 and INT register 2” in “ Configuration of
Register”.
Caution Users cannot use both functions of alarm 1 interrupt and the output of user-set frequency
simultaneously.
CS
1
8
16
24
32
SCK
SIO
R / W
*1
X
0 1 1 0 1 0
B7
B7
B0
B0 B7
B0
Fixed code +
command
During reading: Output mode switching
Day of the
week data
Hour data
Minute data
During reading:
Input mode switching
*1. 0 : INT register 1 selected
1 : INT register 2 selected
Figure 37 INT Register 1 Access and INT Register 2 Access
CS
1
8
16
SCK
SIO
R / W
X 0 1 1 0 1 0 0
B7
B0
Fixed code +
command
Frequency setting
data
During reading:
Input mode switching
During reading: Output mode switching
Figure 38 INT Register 1 (Data Register for output frequency) Access
32
Seiko Instruments Inc.
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