S-35390A Seiko Instruments, S-35390A Datasheet - Page 21

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

Rev.1.2
(4) Per-minute steady interrupt output 1
(3) Per-minute edge interrupt output
INT1ME, INT1FE/
INT2ME, INT2FE
32kE = 0, INT1AE = 0 (INT1 pin output mode)
INT2AE = 0 (INT2 pin output mode)
steady interrupt 1 using status register_2, a clock whose cycle is 1 minute (50% duty) is output from the
INT1 (or INT2) pin.
When the first minute carry is performed after the INT1 (or INT2) pin output mode is set as per-minute
INT1 pin/
INT2 pin
When the first minute carry is performed after the INT1 (or INT2) pin output mode is set as the per-
minute edge interrupt using status register_2, low is output from the INT1 (or INT2) pin. Since the
output is held, in the INT1 pin output mode, rewrite 32kE, INT1AE, INT1ME, and INT1FE of status
register_2 to “0”, and in the INT2 pin output mode, rewrite INT2AE, INT2ME, and INT2FE of status
register_2 to “0” using serial communication to set the output to high (OFF state).
32kE = 0, INT1ME = 0, INT1AE = Don’t care (0 or 1)
INT2ME = 0, INT2AE = Don’t care (0 or 1)
INT1ME/
INT2ME
INT1 pin/
INT2 pin
_00
Caution
Caution
When communication disable or enable is execued while the INT1 (or INT2) pin is
Since the minute carry processing signal is retained for 123 µ s, if communication
disable or enable is executed during this period, low is output from the INT1 (or
INT2) pin again.
low, low is output from the INT1 (or INT2) pin again.
Minute-carry
processing
Figure 20 Timing of Per-Minute Steady Interrupt Output 1
Figure 19 Timing of Per-Minute Edge Interrupt Output
Minute-carry processing
30 s
“L” signal is output again if approx.
123 µs or less.
Change by program (OFF)
30 s
Minute-carry
processing
Seiko Instruments Inc.
30 s
30 s
OFF
Minute-carry
processing
Change by program
Minute-carry
processing
30 s
30 s
“H” signal is output if approx. 123 µs or
more. “L” signal is output by next
minute-carry processing.
2-WIRE REAL-TIME CLOCK
Minute-carry
processing
30 s
“L” signal is output again
if 123 µs or less.
30 s
Minute-carry
processing
S-35390A
30 s
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