3-WIRE REAL-TIME CLOCK
S-35190A
Rev.2.4_00
Alarm setting of “H (hour)”
Status register 2 setting
INT register x alarm enable flag
• AxWE = AxmE = “0”, AxHE = “1”
• Alarm 1 interrupt
32kE
= 0, INT1ME = INT1FE = 0
• Alarm 2 interrupt
None
INT register 1
INT register 2
mx Hx Wx Dx Mx Yx
Alarm interrupt
Comparator
Day of
Second Minute Hour
Day Month Year
the week
Real-time data
Real-time data
H h 00 m 00 s
01 s
59 s
H h 01 m 00 s
H h 59 m 59 s
Change by program
(H
−
1) h 59 m 59 s
(H + 1) h 00 m 00 s
Change by program Change by program
Change by program
INT1AE / INT2AE
INT pin
*1
*1
Alarm time
matches*2
Alarm time matches
OFF
OFF
Period when alarm time matches
*1. If users clear INT1AE/INT2AE once; “L” is not output from the INT 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 INT pin when the minute is counted up.
Figure 27 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 INT pin,
in the AND-form. Set up the data of frequency in the INT register 1.
Refer to “4. INT register 1 and INT register 2” in “ Configuration of Register”.
Status register 2 setting
32kE = 0, INT1AE = Don’t care (0 or 1), INT1ME = 0
Change by program
INT1FE
Free-run output starts
OFF
INT pin
Figure 28 Output Timing of User-set Frequency
Seiko Instruments Inc.
23
SII [ SEIKO INSTRUMENTS INC ]
