S-35392A Datasheet, PDF (22/47 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35392A
Rev.1.3_00
Alarm setting of “H (hour)”
Status register 2 setting
• Alarm 1 function
INT1ME = INT1FE = 0
• Alarm 2 interrupt
INT2ME = INT2FE = 0
INT1 register
INT2 register
INTx register alarm enable flag
• AxmE = AxWE = "0", AxHE = "1"
mx Hx Wx Dx Mx Yx
Comparator
Second Minute
Hour
Day of
the week
Day
Month
Year
Real-time data
Alarm 1 output
(B3 in status register 1)
Alarm 2 interrupt (INT2 pin)/
alarm 2 output
(B2 in status register 1)
Real-time data (H − 1) h 59 m 59 s
Change by program
H h 00 m 00 s 01 s
Change by program
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
INT1AE/INT2AE
INT1 flag/
INT2 flag
Alarm time matches
Status register 1 reading
Status register 1 reading
INT2 pin
Alarm time matches
OFF
*1
Alarm time
*1
matches^*2
OFF
Period when alarm time matches
*1. If users clear INT2AE once; “L” is not output from the INT2 pin by setting 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 INT2 pin when the minute is counted up.
Figure 23 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 INT2
pin, in the AND-form. Set up the data of frequency in the INT2 register.
Refer to “4. INT1 register and INT2 register” in “„ Configuration of Register”
Status register 2 setting
• INT2 pin output mode
INT2AE = Don’t care (0 or 1), INT2ME = 0
Change by program
INT2FE
Free-run output starts
OFF
INT2 pin
Figure 24 Output Timing of User-set Frequency
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Seiko Instruments Inc.