s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 32

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

32
2-WIRE REAL-TIME CLOCK
S-35392A
(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 and the output of user-set frequency
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-35392A in Read.
*1. 0 : INT1 register selected, 1 : INT2 register selected
*2. Set NO_ACK = 1 in Read.
Figure 38 INT1 Register and INT2 Register (Data Register for Output Frequency) Access
SCL
SDA
simultaneously.
I/O mode switching
SDA
SCL
0
Device code +
Figure 37 INT1 Register Access and INT2 Register Access
I/O mode switching
1
1
command
1
0
*1
1
0
0
Device code +
1
1
command
1
R/W
9
0
*1
B7
1
Seiko Instruments Inc.
Day of the
week data
0
R/W
I/O mode switching
9
B7
B0
Frequency
setting data
18
B7
Hour data
B0
I/O mode switching
18
B0
27
B7
Minute data
B0
36
Rev.1.3
_00