s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 10

• Manufacturer Part Number: s-35399a03
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

10
2-WIRE REAL-TIME CLOCK
S-35399A03
Configuration of Register
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.
Year data (00 to 99)
Month data (01 to 12)
Day of week data (00 to 06)
Hour data (00 to 23 or 00 to 11)
Day data (01 to 31)
Second data (00 to 59)
D1
W1
B7
Minute data (00 to 59)
Y1
B7
M1
B7
B7
H1
B7
s1
B7
m1
B7
Start bit of real-time data 1 data access
D2
W2
Start bit of real-time data 2 data access
M2
H2
Y2
m2
s2
Figure 9 Real-Time Data Register
D4
W4
M4
Y4
H4
m4
s4
Seiko Instruments Inc.
D8
M8
Y8
H8
0
m8
s8
D10
Y10
M10
H10
m10
s10
0
D20
Y20
H20
m20
s20
0
0
AM / PM
Y40
m40
s40
0
0
0
Y80
B0
B0
B0
B0
0
B0
0
B0
0
0
B0
0
0
Rev.1.0
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