s-35199a01 Seiko Instruments Inc., s-35199a01 Datasheet - Page 17

• Manufacturer Part Number: s-35199a01
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.0
4. INT register 1 and INT register 2
The INT register 1 is to set up the output of user-set frequency, or to set up alarm 1 interrupt. The INT register 2 is for
setting alarm 2 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. In the INT register
1, 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 the INT pin, a clock pulse and alarm interrupt are output, according to the or-condition
that these two registers have.
(1)
INT register 1
Users can set the alarm time (the data of day of the week, hour, minute) by using the INT register 1 and 2 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 INT register 1 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 INT register 2. 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 INT register 1
(a) 12-hour expression (status register 1 B6 = 0)
(b) 24-hour expression (status register 1 B6 = 1)
Alarm interrupt
_00
B7
B7
W1
H1
m1
B7
set up 7:00 PM
Data written to INT register 1
*1. Don’t care (Both of 0 and 1 are acceptable).
set up 19:00 PM
Data written to INT register 1
*1. Don’t care (Both of 0 and 1 are acceptable).
*2. Set up
W2
m2
H2
Day of week
Day of week
W4
m4
H4
Minute
Minute
Hour
Hour
m8
H8
0
AM
Figure 17 INT Register 1 and 2 (Alarm-Time Data)
/
−
B7
−
B7
m10 m20 m40
H10
1
0
1
0
PM
*1
*1
0
flag along with the time setting.
H20
0
−
−
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
−
−
INT register 2
0
0
1
0
*1
*1
H1
W1
m1
B7
B7
B7
−
−
0
0
0
0
*1
*1
m2
W2
H2
−
−
1
3-WIRE REAL-TIME CLOCK
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
S-35199A01
AM/
PM
0
A2HE
A2WE
A2mE
B0
B0
B0
17