PT7C43390 Datasheet, PDF (19/38 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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b) Alarm setting of "H (hour)"
PT7C43390/43390C
Real-time Clock Module
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*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.
Alarm Interrupt Output Timing
b. 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.
c. 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.
2015-12-0001
PT0280-8 12/11/15
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