S-35399A03 Datasheet, PDF (8/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.1.0_00
„ Configuration of Data Communication
1. Configuration of data Communication
For data communication, the master device in the system generates a start condition for the S-35399A03. Next, the
master device transmits 4-bit device code “0110” or “0111”, and 3-bit command and 1-bit Read/Write command to the
SDA bus. After that, output or input is performed from B7 of data. If data I/O has been completed, finish communication
by inputting a stop condition to the S-35399A03. The master device generates an acknowledgment signal for every
1-byte. Regarding details, refer to “„ Serial Interface”. Device code “0110” is compatible with the SII S-35390A/392A as
software. Regarding details, refer to “2. Configuration of command”.
Start condition
Device code
Command
Read/Write bit
Acknowledgment bit
STA 0
1
1 0 / 1 C2 C1 C0 R / W ACK
1-byte data
Stop condition
B7 B6 B5 B4 B3 B2 B1 B0 ACK STP
Figure 8 Data Communication
8
Seiko Instruments Inc.