s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 16

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

16
2-WIRE REAL-TIME CLOCK
S-35399A02
4. INT1 register and INT2 register
The INT1 and INT2 registers are to set up the output of user-set frequency, or to set up alarm interrupt. Users are able to
switch the output mode by using the status register 2. If selecting to use the output mode for alarm interrupt by status
register 2; this register works as the alarm-time data register. If selecting the output of user-set frequency by status
register 2; this register works as the data register to set the frequency for clock output. From each INT1 and INT2 pin,
a clock pulse and alarm interrupt are output.
(1)
INT1 register
Users can set the alarm time (the data of day of the week, hour, minute) by using the INT1 and INT2 registers which
are 3-byte data registers. The configuration of register is as well as the data register of day of the week, hour, minute,
in the real-time data register; is expressed by the BCD code. Do not set a nonexistent day. Users are necessary to set
up the alarm-time data according to the 12/24 hour expression that they set by using the status register 1.
The INT1 register has A1WE, A1HE, A1mE at B0 in each byte. It is possible to make data valid; the data of day of the
week, hour, minute which are in the corresponded byte; by setting these bits to “1”. This is as well in A2WE, A2HE,
A2mE in the INT2 register. Regarding set-up of year, month, day, refer to “9. Alarm expansion register 1 and alarm
expansion register 2” .
Setting example: alarm time “7:00 pm” in the INT1 register
(a) 12-hour expression (status register 1 B6 = 0)
(b) 24-hour expression (status register 1 B6 = 1)
Alarm interrupt
B7
B7
W1
H1
m1
B7
set up 7:00 PM
Data written to INT1 register
*1. Don’t care (Both of 0 and 1 are acceptable).
set up 19:00 PM
Data written to INT1 register
*1. Don’t care (Both of 0 and 1 are acceptable).
*2. Set up the
W2
m2
H2
Day of week
Day of week
W4
m4
H4
Minute
Minute
Hour
Hour
Figure 15 INT1 Register and INT2 Register (Alarm Time-Data)
m8
H8
0
AM /
−
B7
−
B7
m10 m20 m40
H10
1
0
1
0
*1
*1
0
PM
H20
0
−
−
flag along with the time setting.
1
0
0
0
*1
*1
AM /
PM
Seiko Instruments Inc.
0
−
−
1
0
0
0
*1
*1
A1mE
A1WE
A1HE
B0
B0
B0
−
−
0
0
1
0
*1
*1
−
−
INT2 register
0
0
1
0
*1
*1
H1
W1
m1
B7
B7
B7
−
−
0
0
0
0
*1
*1
m2
W2
H2
−
−
1
1
0
0
*1
*1
*2
m4
W4
H4
B0
B0
m8
1
1
1
H8
0
0
1
0
m10 m20 m40
H10
0
H20
0
AM /
Rev.1.0
PM
0
A2HE
A2mE
A2WE
B0
B0
B0
_00