s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 38

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

38
2-WIRE REAL-TIME CLOCK
S-35399A02
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-35399A02
*1. Set NO_ACK = 1 in Read.
*2. Transmit ACK = 0 from the master device to the S-35399A02 in Read.
*1. 0 : Status register 1 selected, 1 : Status register 2 selected
*2. Set NO_ACK = 1 in Read.
SDA
SCL
SDA
SCL
I/O mode switching
Figure 48 Status Register 1 Access and Status Register 2 Access
I/O mode switching
0
1
1
SDA
command
0
SCL
Code +
1
I/O mode switching
1
1
command
0
Code +
1
0
0
1
0
0
1
Figure 46 Real-Time Data 1 Access
Figure 47 Real-Time Data 2 Access
1
0
R/W
1
1
command
9
B7
Code +
R/W
1
Year data
Seiko Instruments Inc.
9
0
B7
*1
0
Hour data
0
B0
B0
R/W
I/O mode switching
B7
9
I/O mode switching
18
Status data
18
B7
Minute data
B0
I/O mode switching
18
B0
in Read
27
B7
Second data
63
B7
.
Second data
B0
B0
36
72
Rev.1.0
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