S-35192A Datasheet, PDF (15/41 Pages) Seiko Instruments Inc – 3-WIRE REAL-TIME CLOCK

Rev.1.2_00
3-WIRE REAL-TIME CLOCK
S-35192A
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) Alarm function
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.
INT register 1
INT register 2
W1 W2 W4 0 0 0 0 _A1WE
B7
B0
W1 W2 W4 ₀
B7
00
0 A2WE
B0
H1
H2
H4
H8
H10
H20
AM/
PM
A1HE
B7
B0
H1
H2
H4
H8
H10
H20
AM/
PM
A2HE
B7
B0
m1 m2 m4 m8 m10 m20 m40 A1mE
m1 m2 _m4 m8 m10 _m20 m40 A2mE
B7
B0
B7
B0
Figure 15 INT Register 1 and INT Register 2 (Alarm-Time Data)
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)
set up 7:00 PM
Data written to INT register 1
Day of the week −^*1
−^*1
−^*1
−^*1
−^*1
−^*1
−^*1
0
Hour 1
1
1
0
0
0
1
1
Minute 0
0
0
0
0
0
0
1
B7
B0
*1. Don’t care (Both of 0 and 1 are acceptable).
(b) 24-hour expression (status register 1 B6 = 1)
set up 19:00 PM
Data written to INT register 1
Day of the week −^*1
−^*1
−^*1
−^*1
−^*1
−^*1
−^*1
0
Hour 1
0
0
1
1
0
1^*2
1
Minute 0
0
0
0
0
0
0
1
B7
B0
*1. Don’t care (Both of 0 and 1 are acceptable).
*2. Set up AM / PM flag along with the time setting.
Seiko Instruments Inc.
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