S-35390A Seiko Instruments, S-35390A Datasheet - Page 10

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

10
2-WIRE REAL-TIME CLOCK
S-35390A
1. Real-time data register
Register Configuration
The real-time data register is a 56-bit register that stores the BCD code of the year, month, day, day of
week, hour, minute, and second data. Any read/write operation performed by the real-time data access
command transmits or receives the data from the LSB which is the first digit of the year.
MSB
MSB
MSB
MSB
MSB
MSB
MSB
Y80
0
0
0
0
0
0
m40
Y40
AM/
s40
PM
0
0
0
m20
D20
H20
Y20
s20
0
0
m10
M10
D10
H10
Y10
s10
0
M8
m8
Y8
D8
H8
s8
0
W4
M4
m4
Y4
D4
H4
Figure 8 Real-time Data Register
s4
W2
M2
m2
Y2
D2
H2
s2
Seiko Instruments Inc.
LSB
LSB
LSB
LSB
LSB
LSB
LSB
W1
M1
m1
Y1
D1
H1
s1
Day data (01 to 31)
Year data (00 to 99)
Month data (01 to 12)
Hour data (00 to 23 or 00 to 11)
Minute data (00 to 59)
Day of week data (00 to 06)
Second data (00 to 59)
The count value is automatically changed by the
auto calendar feature.
Sets the lower two digits of the Western Calendar
Year (00 to 99) and links together with the auto
calendar feature until 2099.
A septenary counter. Set it so that it corresponds
to the day of the week.
AM/PM
For a 12-hour expression, write 0 and 1 for AM
and PM, respectively.
For a 24-hour expression, either 0 or 1 can be
written. 0 is read when the hour data is from 00
to 11, and 1 is read when from 12 to 23.
1 to 31: 31-day months (1, 3, 5, 7, 8, 10, 12)
1 to 30: 30-day months (4, 6, 9, 11)
1 to 29: Feb. (leap year)
1 to 28: Feb. (common year)
Rev.1.2
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