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S-35399A03-J8T2G Datasheet(PDF) 11 Page - Seiko Instruments Inc

Part # S-35399A03-J8T2G
Description  2-WIRE REAL-TIME CLOCK
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

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2-WIRE REAL-TIME CLOCK
Rev.3.1_02
S-35399A03
11
Configuration of Registers
1. Real-time data register
The real-time data register is a 7-byte register that stores the data of year, month, day, day of the week, hour, minute, and
second in the BCD code. To write / read real-time data 1 access, transmit / receive the data of year in B7, month, day, day
of the week, hour, minute, second in B0, in 7-byte. When you skip the procedure to access the data of year, month, day,
day of the week, read / write real-time data 2 access. In this case, transmit / receive the data of hour in B7, minute,
second in B0, in 3-byte.
The S-35399A03 transfers a set of data of time to the real-time data register when it recognizes a reading instruction.
Therefore, the S-35399A03 keeps precise time even if time-carry occurs during the reading operation of the real-time
data register.
Year data (00 to 99)
Month data (01 to 12)
Day data (01 to 31)
Hour data (00 to 23 or 00 to 11)
Minute data (00 to 59)
Second data (00 to 59)
Y80
Y40
Y4
Y8
Y10
Y20
Y2
Y1
B7
B0
M1
M2
M4
M8
M10
0
0
0
D1
D2
D4
D8
D10
D20
0
0
W1
W2
W4
0
0
0
0
0
H1
H4
H8
H10
H20
H2
0
m1
s2
s4
s8
s10
s20
s40
0
m8
m10
m20
m40
0
m4
m2
AM / PM
s1
Start bit of real-time data 2 data access
Start bit of real-time data 1 data access
Day of week data (00 to 06)
B7
B0
B7
B0
B7
B0
B7
B0
B7
B0
B7
B0
Figure 9 Real-Time Data Register


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