s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 34

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

34
2-WIRE REAL-TIME CLOCK
S-35399A03
(2) Data Write in S-35399A03
After detecting a start condition, S-35399A03 receives device code and command. The S-35399A03 enters the
Write-data mode by the Read/Write bit “0”. Input data from B7 to B0 in 1-byte. The S-35399A03 outputs an
acknowledgment signal (“L”) every moment that 1-byte data is input. After receiving the acknowledgment signal
which is for the last byte-data, input a stop condition to the S-35399A03 to finish access.
SDA
SCL
3-byte data
Code + command
: Output from S-35399A03
: Input from master device
0
Figure 37 Example of Data Write 1 (1-Byte Data Register)
Figure 38 Example of Data Read 2 (3-Byte Data Register)
1
1
SDA
1
SCL
1-byte data
0
0
1
1 0
Code + command
: Output from S-35399A03
: Input from master device
R/W
0
B7
9
1
1
Seiko Instruments Inc.
1
0
0
0
0 0
B0
R/W
B7
18
B7
9
B0
B0
18
B7
27
B0
36
Rev.1.0
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