s-35192a Seiko Instruments Inc., s-35192a Datasheet - Page 15

• Manufacturer Part Number: s-35192a
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.2
4. INT register 1 and INT register 2
The INT register 1 and the INT register 2 are to set up the alarm time. The alarm output mode gets enable by using the
status register 2, these registers work as data registers for alarm time. When disable, the INT register 1 works as a 1-byte
free register. Users are able to make sure the alarm output by reading the INT1/INT2 flag (B3 or B2 in the status register
1).
(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.
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 function
_00
B7
B7
W1
H1
m1
B7
Day of the week
Day of the week
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
W4
m4
H4
Minute
Minute
Hour
Hour
Figure 15 INT Register 1 and INT Register 2 (Alarm-Time Data)
m8
H8
0
AM
/
−
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
AM/
S-35192A
PM
0
A2HE
A2WE
A2mE
B0
B0
B0
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