S-35399A03 Datasheet, PDF (25/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.1.0_00
2-WIRE REAL-TIME CLOCK
S-35399A03
3. Per-minute edge interrupt output
Per-minute edge interrupt output is the function to output “L” from the INT1 / INT2 pin, when the first minute-carry
processing is done, after selecting the output mode. To set the pin output to “H”, turn off the output mode of per-minute
edge interrupt. In the INT1 pin output mode, input “0” in INT1ME in the status register 2. In the INT2 pin output mode,
input “0” in INT2ME.
Status register 2 setting
• INT1 pin output mode
32kE = 0, INT1AE = Don’t care (0 or 1), INT1FE = 0
• INT2 pin output mode
INT2AE = Don’t care (0 or 1), INT2FE = 0
Change by program
INT1ME/INT2ME
INT1 pin/INT2 pin
Minute-carry processing _OFF
Minute-carry
processing
"L" is output again if this period is within 7.9 ms^*1.
*1. Pin output is set to “H” by disabling the output mode within 7.9 ms, because the signal of this procedure is
maintained for 7.9 ms. Note that pin output is set to “L” by setting enable the output mode again.
Figure 27 Timing of Per-Minute Edge Interrupt Output
4. Minute-periodical interrupt output 1
The minute-periodical interrupt 1 is the function to output the one-minute clock pulse (Duty 50%) from the INT1 / INT2
pin, when the first minute-carry processing is done, after selecting the output mode.
Status register 2 setting
• INT1 pin output mode
32kE = 0, INT1AE = 0
• INT2 pin output mode
INT2AE = 0
Change by program (OFF)
INT1ME, INT1FE
INT2ME, INT2FE
Minute-carry
processing
Minute-carry
processing
Minute-carry
processing
Minute-carry
processing
Minute-carry
processing
INT1 pin/INT2 pin
30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s
"L" is output again if this period is within 7.9 ms^*1.
"H" is output again if this period is within 7.9 ms.
"L" is output at the next minute-carry processing
*1. Setting the output mode disable makes the pin output “H”, while the output from the INT1 / INT2 pin is in “L”.
Note that pin output is set to “L” by setting enable the output mode again.
Figure 28 Timing of Minute-periodical Interrupt Output 1
Seiko Instruments Inc.
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