3-WIRE REAL-TIME CLOCK
S-35190A
Rev.2.4_00
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)
Start bit of real-time data 1 data access
Y1
B7
Y2
Y40
Y4
Y8
Y10 Y20
Y80
B0
Month data (01 to 12)
M1
B7
M2
M4
M8 M10
0
0
0
B0
Day data (01 to 31)
D1
B7
D2
D4
D8
D10 D20
0
0
0
B0
Day of the week data (00 to 06)
W1
B7
W2
W4
0
0
0
0
B0
Hour data (00 to 23 or 00 to 11)
Start bit of real-time data 2 data access
H2
H1
B7
H4
H8
H10 H20
0
AM / PM
B0
Minute data (00 to 59)
m1
B7
m2
m4
m8
m10 m20 m40
0
B0
Second data (00 to 59)
s2
s4
s8
s10
s20
s40
0
s1
B7
B0
Figure 14 Real-time Data Register
Seiko Instruments Inc.
11
SII [ SEIKO INSTRUMENTS INC ]
