S-35390A Datasheet, PDF (33/54 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.2.4_00
2-WIRE REAL-TIME CLOCK
S-35390A
(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.
Regarding details of each data, refer to “4. INT1 register and INT2 register” in “„ Configuration of Register”.
Caution Users cannot use both functions of alarm 1 interrupt and output of user-set frequency for the INT1
pin and INT2 pin simultaneously.
1
9
18
27
36
SCL
SDA
*1
R/W
0 11010
Device code +
command
I/O mode switching
B7
B0 ^B7
B0 B7
B0
Day of the week
data
Hour data
I/O mode switching
Minute data
*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-35390A in Read.
Figure 41 INT1 Register Access and INT2 Register Access
1
9
18
SCL
SDA
*1
0 11010
R/W
Device code +
command
I/O mode switching
B7
B0
Frequency
setting data
I/O mode switching
*1. 0 : INT1 register selected, 1 : INT2 register selected
*2. Set NO_ACK = 1 in Read.
Figure 42 INT1 Register and INT2 Register (Data Register for Output Frequency) Access
Seiko Instruments Inc.
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