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2015-12-0001

PT0280-8

12/11/15

21

PT7C43390/43390C

Real-time Clock Module

(2) During reading in the real-time data register

(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.