s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 21

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.3
Alarm 1 Function and
*1. If users clear INT2AE once; “L” is not output from the
In the output mode for
alarm 2 interrupt, user-set frequency, per-minute edge interrupt, minute-periodical interrupt. To switch the output mode for
Register”.
When switching the output mode for
interrupt output, or the output of user-set frequency, switch the output mode after setting “00h” in the INT2 register. In
per-minute edge interrupt output/minute-periodical interrupt output, it is unnecessary to set data in the INT2 register for
users.
Refer to the followings regarding each operation of output modes.
1. Alarm 1 function and alarm 2 interrupt
INT
Alarm 2 interrupt output is the function to set the INT2 flag “H” by the output “L” from the
which is set by user has come. If setting the pin output to “H”, turn off the alarm function by setting “0” in INT2AE in the
status register 2.
By Read, the INT2 flag is once cleared automatically. In the alarm 1 function, the INT1 flag (B3 in the status register1) is
set to “H” when the set time has come. The INT1 flag is also cleared once by Read.
In the alarm 1 function, set the data of day of the week, hour, minute of the alarm time in the INT1 register. In alarm 2
interrupt, set in the INT2 register. Refer to “4. INT1 register and INT2 register” in “ Configuration of Register”.
Alarm setting of “W (day of the week), H (hour), m (minute)”
the alarm time matches real-time data.
2
Status register 2 setting
• Alarm 1 function
• Alarm 2 interrupt
INT1AE/INT2AE
pin and the alarm 1 function, use the status register 2. Refer to 3. Status register 2 in “
INT1ME = INT1FE = 0
INT2ME = INT2FE = 0
Real-time data
_00
INT1 flag/
INT2 flag
INT2 pin
W (day of the week)
INT
Change by program
H h (m − 1) m 59 s
2
Alarm time matches
Alarm time matches
pin, users are able to select the output;
Second
INT
Figure 22 Alarm Interrupt Output Timing (1/2)
2
Real-time data
INT
Minute
Pin Output Mode
mx
2
INT1 register
INT2 register
pin, be careful of the output status of the pin. Especially, when using alarm 2
Hour
Seiko Instruments Inc.
Hx
H h 00 m 00 s
Period when alarm time matches
Change by program
the week
Day of
Comparator
Wx
OFF
INT
INTx register alarm enable flag
• AxHE = AxmE = AxWE = "1"
Day Month
2
01 s
pin by setting INT2AE enable again, within a period when
Status register 1 reading
Change by program
Year
*1
2-WIRE REAL-TIME CLOCK
59 s
Alarm 1 output
(B3 in status register 1)
Alarm 2 interrupt (INT2 pin)/
alarm 2 output
(B2 in status register 1)
H h (m + 1) m 00 s
INT
2
pin, at the alarm time
Configuration of
S-35392A
21