S-35399A03 Datasheet, PDF (36/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.1.0_00
(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 for the INT1 pin and INT2 pin and the
output of user-set frequency simultaneously.
1
9
18
27
36
SCL
SDA
*1
0 11010
R/W
Code +
command
I/O mode switching
B7
B0 ^B7
B0 B7
B0
Day of 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-35399A03 in Read.
Figure 42 INT1 Register Access and INT2 Register Access
1
9
18
SCL
SDA
*1
R/W
0 11010
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 43 INT1 Register and INT2 Register (Data Register for output frequency) Access
36
Seiko Instruments Inc.