S-35192A-I8T1G SII [Seiko Instruments Inc], S-35192A-I8T1G Datasheet - Page 25

• Manufacturer Part Number: S-35192A-I8T1G
• Description: 3-WIRE REAL-TIME CLOCK
• Manufacturer: SII [Seiko Instruments Inc]

Rev.1.2
Serial Interface
The S-35192A receives various commands via a 3-wire serial interface to Read/Write data. Regarding transmission is as
follows.
1. Data Read
2. Data Write
3. Data access
SCK
SIO
When data is input from the SIO pin in synchronization with the falling of the SCK clock after setting the CS pin to “H”, the
data is loaded internally in synchronization with the next rising of the SCK clock. When
eighth rising of the SCK clock, the state of data reading is entered. Data corresponding to each command is then output
in synchronization with the falling of the subsequent SCK clock input. When the SCK clock is less than 8, the IC is in
the clock-wait status, and no processing is performed.
When data is input from the SIO pin in synchronization with the falling of the SCK clock after setting the CS pin to “H”, the
data is loaded internally in synchronization with the next rising of the SCK clock. When
eighth rising of the SCK clock, the state of data writing is entered. In this state, the data, which is input in synchronization
with the falling of the subsequent SCK clock input, is written to registers according to each command. In data Write, input
a clock pulse which is equivalent to the byte of the register. As well as in Read, when the SCK clock is less than 8, the IC
is in the clock-wait status, and no processing is performed.
(1) Real-time data 1 access
CS
_00
X
0
Fixed code +
1
1
command
1
0
0
1
0
8
B7
R / W
Year data
During reading: Output mode switching
Figure 25 Real-Time Data 1 Access
B0
Seiko Instruments Inc.
16
56
B7
3-WIRE REAL-TIME CLOCK
Second data
R
R
/
/
During reading:
Input mode switching
W
W
B0
64
bit = “0” is loaded at the
bit = “1” is loaded at the
S-35192A
25