S-35399A02 Datasheet, PDF (36/55 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A02
Rev.1.0_00
The followings are Read/Write in the S-35399A02.
(1) Data Read in S-35399A02
After detecting a start condition, the S-35399A02 receives device code and command. The S-35399A02 enters the
Read-data mode by the Read/Write bit “1”. The data is output from B7 in 1-byte. Input an acknowledgment signal
from the master device every moment that the S-35399A02 outputs 1-byte data. However, do not input an
acknowledgment signal (input NO_ACK) for the last data-byte output from the master device. This procedure
notifies the completion of Read. Next, input a stop condition to the S-35399A02 to finish access.
1-byte data
1
9
18
SCL
SDA
R/W
0 110 000 ₁
B7
B0
Code + command
: Output from S-35399A02
: Input from master device
Input NO_ACK after the 1st
byte of data has been output.
Figure 42 Example of Data Read 1 (1-Byte Data Register)
3-byte data
1
9
18
SCL
SDA
R/W
0 1100 1 11
B7
Code + command
B0 B7
: Output from S-35399A02
: Input from master device
27
36
B0 B7
B0
Input NO_ACK after the 3rd byte of data
has been output.
Figure 43 Example of Data Read 2 (3-Byte Data Register)
36
Seiko Instruments Inc.