PT7C43390 Datasheet, PDF (21/38 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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(2) During reading in the real-time data register
PT7C43390/43390C
Real-time Clock Module
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(3) During writing in the real-time data register
Timing of Minute-periodical Interrupt Output 2
f. Operation of power-on detection circuit (only in the INT1 pin output mode)
When power is applied to the RTC, the power-on detection operates to set "1" in the POC flag (B0 in the status register 1). A 1 Hz
clock pulse is output from the INT1 pin.
9.2. Alarm 1 Function and INT2 Pin Output Mode
In the output mode for INT2 pin, users are able to select the output; alarm 2 interrupt, user-set frequency, per-minute edge
interrupt, minute-periodical interrupt. To switch the output mode for INT2 pin and the alarm 1 function, use the status register 2.
Refer to "Status register 2" in "Configuration of Registers". When switching the output mode for INT2 pin, be careful of the
output status of the pin. Especially, when using alarm 2 interrupt output, or the output of user-set frequency, switch the output
mode after setting "00h" in the INT2 register. In per-minute edge interrupt output / minute-periodical interrupt output, it is
unnecessary to set data in the INT2 register for users. Refer to the followings regarding each operation of output modes.
2015-12-0001
PT0280-8 12/11/15
21