S-35390A Seiko Instruments, S-35390A Datasheet - Page 29

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

Rev.1.2
(3) Status register_1 access and status register_2 access
(4) INT1 register_1 access and INT1 register_2 access
*1. 0: INT1 register_1 selected, 1:INT1 register_2 selected
*2. During reading, set NO_ACK to 1.
*3. During reading, transmit ACK = 0 to S-35390A from the master device.
_00
Since data written to and read from INT1 register_1 varies according to the setting of status
*1. 0: Status register_1 selected, 1: Status register_2 selected
*2. During reading, set NO_ACK to 1.
register_2, be sure to set status register_2 before reading/writing INT1 register_1. When an alarm is
set using status register_2, these registers function as 3-byte alarm time data registers, and other
than that, they function as 1-byte registers. When the selected frequency steady interrupt setting is
set, the data in these registers is frequency duty setting data.
Since data written to and read from INT1 register_2 varies according to the setting of status
Caution
register_2, be sure to set status register_2 before reading/writing INT1 register_1. When an alarm is
set using status register_2, these registers function as 3-byte alarm time data registers, and other
than that, they function as 1-byte registers. When the selected frequency steady interrupt setting is
set, the data in these registers is frequency duty setting data.
For details of each data, refer to “ Status register_1 ” and “ Status register_2 ”.
SDA
SCL
I/O mode switching
Figure 28 Status Register_1 Access and Status Register_2 Access
Alarm data and frequency duty data cannot be operated simultaneously.
0
MSB
1
1
Command
1
SDA
Figure 29 INT1 Register_1 Access and INT1 Register_2 Access
SCL
0
*1
1
I/O mode switching
0
LSB
R/W
0
MSB
LSB
9
Command
1
1
week data
1
Day of
Seiko Instruments Inc.
0
*1
0
0
MSB
LSB
R/W
LSB
I/O mode switching
9
Status data
MSB
I/O mode switching
18
2-WIRE REAL-TIME CLOCK
LSB
Minute data
MSB
36
S-35390A
29