s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 26

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

26
2-WIRE REAL-TIME CLOCK
S-35399A02
*1. If users clear INT1AE/INT2AE once; “L” is not output from the
These are selectable for the output mode for
Alarm interrupt, the output of user-set frequency, per-minute edge interrupt output, minute-periodical interrupt output 1. In
the
also selectable.
To swith the output mode, use the status register 2. Refer to “ 3. status register 2 ” in “ Configuration of Register ”.
When switching the output mode, be careful of the output status of the pin. Especially, when using alarm interrupt/output of
frequency, switch the output mode after setting “00h” in the INT1/INT2 register. In 32.768 kHz output/per-minute edge
interrupt output/minute-periodical interrupt output, it is unnecessary to set data in the INT1/INT2 register for users.
Refer to the followings regarding each operation of output modes.
1. Alarm interrupt output
INT
Alarm interrupt output is the function to output “L” from the
come. If setting the pin output to “H”, turn off the alarm function by setting “0” in INT1AE/INT2AE in the status register 2.
To set the alarm time, set the data of day of the week, hour, minute in the INT1/INT2 register, set the data of year, month,
day in the alarm expansion register 1 or 2. Refer to “4. INT1 register and INT2 register” and “9. Alarm expansion
register 1 and alarm expansion register 2” in “ Configuration of Register” .
Alarm setting of “Y (year), M (month), D (day), W (day of week), H (hour), m (minute)”
enable again, within a period when the alarm time matches real-time data.
INT
1
,
1
INT1 pin/INT2 pin
INT
INT1AE/INT2AE
pin output mode, in addition to the above modes, minute-periodical interrupt output 2 and 32.768 kHz output are
Real-time data
Y (year), M (month), D (day), W (day of week)
2
Pin Output Modes
Status register 2 setting
• INT1 pin output mode
• INT2 pin output mode
32kE = 0, INT1ME = INT1FE = 0
INT2ME = INT2FE = 0
Change by program
H h (m − 1) m 59 s
Alarm time matches
Second
Figure 30 Alarm Interrupt Output Timing (1/2)
Real-time data
Minute
mx
INT1 register
INT2 register
INT
Seiko Instruments Inc.
Hour Week
1
Hx
and
H h 00m 00 s
Period when alarm time matches
Change by program
INT
Wx
Comparator
OFF
2
Alarm expansion register 1
Alarm expansion register 2
INT /
pins;
Day
Dx
1
INTx register alarm enable flag
• AxHE = AxmE = AxWE = "1"
Alarm expansion register x alarm enable flag
• AxYE = AxME = AxDE = "1"
01 s
INT
Month
Mx
2
pin, at the alarm time which is set by user has
INT /
Change by program
Year
Yx
*1
1
INT
59 s
2
pin by setting INT1AE/INT2AE
Alarm interrupt
H h (m + 1) m 00 s
Rev.1.0
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