s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 35

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

Rev.1.0
4. Data access
(1) Real-time data 1 access
(2) Real-time data 2 access
(3) Status register 1 access and status register 2 access
*1. Set NO_ACK = 1 in Read.
*2. Transmit ACK = 0 from the master device to the S-35399A03
*1. Set NO_ACK = 1 in Read.
*2. Transmit ACK = 0 from the master device to the S-35399A03 in Read.
*1. 0 : Status register 1 selected, 1 : Status register 2 selected
*2. Set NO_ACK = 1 in Read.
_00
SDA
SCL
SDA
SCL
I/O mode switching
Figure 41 Status Register 1 Access and Status Register 2 Access
I/O mode switching
0
1
SDA
1
0
SCL
command
1
Code +
1
1
command
I/O mode switching
0
Code +
1
0
0
1
0
0
1
Figure 39 Real-Time Data 1 Access
Figure 40 Real-Time Data 2 Access
1
0
R/W
1
1
command
9
Code +
B7
R/W
1
Seiko Instruments Inc.
9
B7
0
Year data
*1
0
Hour data
0
B0
I/O mode switching
B0
R/W
B7
9
I/O mode switching
18
Status data
18
B7
Minute data
B0
I/O mode switching
18
B0
in Read
27
B7
2-WIRE REAL-TIME CLOCK
Second data
63
B7
.
Second data
B0
B0
36
72
S-35399A03
35