s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 14

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

14
2-WIRE REAL-TIME CLOCK
S-35392A
4. INT1 register and INT2 register
The INT1 register is to set up the alarm time. The INT2 register is to set up the output of user-set frequency or alarm
interrupt. To switch the output mode, use the status register 2.
The INT1 register works as an alarm-time data register in the alarm 1 interrupt mode selected by users. The INT1 flag (B3
in the status register) displays the alarm time when it matches.
The INT2 register works as an alarm-time data register in the alarm interrupt mode selected by using the status register 2.
In the mode output of user-set frequency, the INT2 register works as a data register to set up the frequency for output
clock. Clock pulse and output of alarm interrupt are output from the
register) displays the alarm time when it matches.
(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.
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
Day of the week
Day of the week
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
W4
m4
H4
Minute
Minute
Hour
Hour
Figure 12 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
INT
*1
*1
m2
2
W2
H2
pin. And The INT2 flag (B2 in the status
−
−
1
1
0
0
*1
*1
*2
m4
W4
H4
B0
B0
m8
H8
0
1
1
0
1
1
0
m10 m20 m40
H10
0
H20
0
AM /
Rev.1.3
PM
0
A2HE
A2WE
A2mE
B0
B0
B0
_00