S-35190A Datasheet, PDF (15/53 Pages) Seiko Instruments Inc – 3-WIRE REAL-TIME CLOCK

Rev.2.4_00
3-WIRE REAL-TIME CLOCK
S-35190A
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) Alarm interrupt
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
W1 W2 W4 _{0 0 0 0 A2WE}
B7
B0
B7
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 17 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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