s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 12

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

12
2-WIRE REAL-TIME CLOCK
S-35399A02
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)
Hour data (00 to 23 or 00 to 11)
Day of week data (00 to 06)
Second data (00 to 59)
Day data (01 to 31)
Minute data (00 to 59)
W1
H1
Y1
B7
M1
D1
B7
B7
B7
B7
m1
s1
B7
B7
Start bit of real-time data 2 data access
Start bit of real-time data 1 data access
W2
H2
M2
D2
m2
s2
Y2
Figure 12 Real-Time Data Register
W4
M4
H4
m4
Y4
D4
s4
Seiko Instruments Inc.
H8
M8
m8
Y8
D8
s8
0
H10
M10
Y10
D10
m10
s10
0
H20
Y20
D20
m20
s20
0
0
AM / PM
Y40
m40
s40
0
0
0
Y80
B0
B0
B0
B0
B0
B0
B0
0
0
0
0
0
0
Rev.1.0
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