s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 36

• Manufacturer Part Number: s-35399a03
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

36
2-WIRE REAL-TIME CLOCK
S-35399A03
(4) INT1 register access and INT2 register access
In Read/Write the INT1 and INT2 registers, data varies depending on the setting of the status register 2. Be sure to
Read/Write 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.
Caution Users cannot use both functions of alarm 1 interrupt for the
Regarding details of each data, refer to “4. INT1 register and INT2 register” in “ Configuration of Register” .
*1. 0 : INT1 register selected, 1 : INT2 register selected
*2. Set NO_ACK = 1 in Read.
*3. Transmit ACK = 0 from the master device to the S-35399A03 in Read.
*1. 0 : INT1 register selected, 1 : INT2 register selected
*2. Set NO_ACK = 1 in Read.
Figure 43 INT1 Register and INT2 Register (Data Register for output frequency) Access
output of user-set frequency simultaneously.
SDA
SCL
I/O mode switching
Figure 42 INT1 Register Access and INT2 Register Access
SDA
SCL
0
command
1
1
I/O mode switching
Code +
1
0
*1
1
0
0
1
1
command
Code +
1
R/W
9
Day of week data
B7
*1
0
Seiko Instruments Inc.
1
0
R/W
I/O mode switching
9
B0
B7
Frequency
setting data
18
B7
Hour data
B0
I/O mode switching
18
B0
27
B7
Minute data
INT
1
B0
pin and
36
INT
2
Rev.1.0
pin and the
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