S-35390A Seiko Instruments, S-35390A Datasheet - Page 13

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

Rev.1.2
4. INT1 register_1 and INT1 register_2
The example of setting In case of the setting alarm time “PM 7:00” in INT1 register_1
INT1 register_1 and INT1 register_2 are interrupt setting registers that can be set independently. The
interrupts are output from the INT1 pin and INT2 pin. The function is switched by using status register_2.
(1) Alarm interrupt
INT1 register_1
Data set in INT1 register_1 and INT1 register_2 is considered as alarm time data. Having the same
configuration as the hour and minute registers of the real-time data register, these registers represent
hours and minutes with BCD codes. When setting these registers, do not set any nonexistent day.
Data to be set must be in accordance with the 12-hour or 24-hour expression that is set in status
register_1.
each bit to “1”, the setting of the day of week data, hour data, and minute data in the corresponding
byte becomes valid. A2WE, A2HE, and A2mE of INT1 register_2 are the same.
In INT1 register_1, A1WE, A1HE, and A1mE are respectively in the MSB of each byte. By setting
_00
A1WE
A1mE
MSB
A1HE
MSB
MSB
Day of week data
Day of week data
m40
AM/
PM
Minute data
Minute data
(1) 12-hour expression (status register_1 B1 = 0)
(2) 24-hour expression (status register_1 B1 = 1)
0
Hour data
Hour data
: set up 19:00 PM
Writing in INT1 register_1
: set up 7:00 PM
Writing in INT1 register_1
m20
H20 H10
Figure 11 INT1 Register_1, INT1 Register_2 (Alarm Time Data)
0
m10
0
MSB
*1. Don’t care (Both of 0 and 1 are acceptable).
MSB
*1. Don’t care (Both of 0 and 1 are acceptable).
*2. Set up AM/PM flag along with the time setting.
m8
H8
0
0
0
1
1
1
1
W4
m4
H4


1
1
0
0
W2
m2
H2
*2
*1
*1
Seiko Instruments Inc.
LSB
LSB
LSB
W1
m1
H1


0
0
0
0
*1
*1


INT1 register_2
0
0
1
0
*1
*1
A2mE
A2HE
A2WE
MSB
MSB
MSB


0
0
1
0
m40
AM/
PM
*1
*1
0
2-WIRE REAL-TIME CLOCK
m20
H20 H10
0


1
0
0
0
*1
*1
m10
0
m8


H8
0
1
0
0
0
*1
*1
W4
H4
m4


LSB
LSB
1
0
1
0
m2
W2
H2
S-35390A
*1
*1
LSB
LSB
LSB
W1
m1
H1
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