參數(shù)資料
型號: S-35180AT8T1
元件分類: 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述: REAL TIME CLOCK, PDSO8
封裝: TSSOP-8
文件頁數(shù): 18/46頁
文件大小: 498K
代理商: S-35180AT8T1
3-WIRE REAL-TIME CLOCK
Rev.2.0_00
S-35180A
Seiko Instruments Inc.
25
Serial Interface
The S-35180A receives various commands via a 3-wire serial interface to read/write data. This section
covers the transfer methods of this product.
1. Data reading
When data is input from the SIO pin in synchronization with the falling of the SCK pin after setting the CS
pin to “H”, the data is loaded internally. When R/W bit = “1” is loaded at the 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.
Remark When the number of SCK clocks is less than eight, the state of clock waiting is entered and
no processing occurs.
2. Data writing
When data is input from the SIO pin in synchronization with the falling of the SCK pin after setting the CS
pin to “H”, the data is loaded internally. When R/W bit = “0” is loaded at the 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.
(1) Real-time data access 1
64
8
1
0
1
0
1
0
X
During reading: Output mode switching
CS
SCK
SIO
Year data
Second data
LSB
MSB
LSB
MSB
Duaring reading: Input mode switching
Command
LSB
MSB
R/W
Figure 25 Real-time Data Access 1
(2) Real-time data access 2
32
8
1
0
1
0
X
During reading: Output mode switching
CS
SCK
SIO
Hour data
Second data
LSB
MSB
LSB
MSB
During reading: Input mode switching
Command
LSB
MSB
R/W
Figure 26 Real-time Data Access 2
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