S-35399A03 Datasheet, PDF (24/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35399A03
Alarm setting of “H (hour)”
Status register 2 setting
• INT1 pin output mode
32kE = 0, INT1ME = INT1FE = 0
• INT2 pin output mode
INT2ME = INT2FE = 0
INT1 register
INT2 register
INTx register alarm enable flag
• AxHE = AxmE = AxWE = "1"
Alarm expansion register x alarm enable flag
• AxYE = AxME = AxDE = "1"
Alarm expansion register 1
Alarm expansion register 2
mx Hx Wx Dx Mx Yx
Rev.1.0_00
Comparator
Alarm interrupt
Second Minute Hour Week Day Month Year
Real-time data
Real-time data _{(H − 1) h 59 m 59 s}
Change by program
H h 00 m 00 s 01 s
59 s H h 01 m 00 s
H h 59 m 59 s (H + 1) h 00 m 00 s
Change by program ^{Change by program}
Change by program
INT1AE/INT2AE
INT1 pin/INT2 pin
Alarm time matches
OFF
*1
*1
Alarm time
matches^*2
OFF
Period when alarm time matches
*1. If users clear INT1AE/INT2AE once; “L” is not output from the INT1 / INT2 pin by setting INT1AE/INT2AE
enable again, within a period when the alarm time matches real-time data.
*2. If turning the alarm output on by changing the program, within the period when the alarm time matches
real-time data, “L” is output again from the INT1 / INT2 pin when the minute is counted up.
Figure 25 Alarm Interrupt Output Timing (2/2)
2. Output of user-set frequency
The output of user-set frequency is the function to output the frequency which is selected by using data, from the
INT1/ INT2 pin, in the AND-form. Set up the data of frequency in the INT1/INT2 register.
Refer to “4. INT1 register and INT2 register” in “„ Configuration of Register”.
Status register 2 setting
• INT1 pin output mode
32kE = 0, INT1AE = Don’t care (0 or 1), INT1ME = 0
• INT2 pin output mode
INT2AE = Don’t care (0 or 1), INT2ME = 0
Change by program
INT1FE/INT2FE
Free-run output starts
INT1 pin/INT2 pin
OFF
Figure 26 Output Timing of User-set Frequency
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Seiko Instruments Inc.