S-35399A02 Datasheet, PDF (37/55 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.1.0_00
2-WIRE REAL-TIME CLOCK
S-35399A02
(2) Data Write in S-35399A02
After detecting a start condition, S-35399A02 receives device code and command. The S-35399A02 enters the
Write-data mode by the Read/Write bit “0”. Input data from B7 to B0 in 1-byte. The S-35399A02 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-35399A02 to finish access.
1-byte data
1
9
18
SCL
SDA
R/W
0 110 000 0
B7
B0
Code + command
: Output from S-35399A02
: Input from master device
Figure 44 Example of Data Write 1 (1-Byte Data Register)
3-byte data
1
9
SCL
SDA
R/W
0 110 011 0
B7
Code + command
: Output from S-35399A02
: Input from master device
18
B0 B7
27
B0 B7
36
B0
Figure 45 Example of Data Read 2 (3-Byte Data Register)
Seiko Instruments Inc.
37