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2015-12-0001

PT0280-8

12/11/15

22

PT7C43390/43390C

Real-time Clock Module

a. Alarm 1 function and Alarm 2 Interrupt

Alarm 2 interrupt output is the function to set the INT2 flag "H" by the output "L" from the INT2 pin, at the alarm time which is

set by user has come. If setting the pin output to "H", turn off the alarm function by setting "0" in INT2AE in the status register 2.

By reading, the INT2 flag is once cleared automatically. In the alarm 1 function, the INT1 flag (B3 in the status register 1) is set to

"H" when the set time has come. The INT1 flag is also cleared once by reading. In the alarm 1 function, set the data of day of the

week, hour, minute of the alarm time in the INT1 register. In alarm 2 interrupt, set in the INT2 register.

1) Alarm setting of "W (day of the week), H (hour), m (minute)"

*1. If users clear INT2AE once; "L" is not output from the INT2 pin by setting INT2AE enable again, within a period when the

alarm time matches real-time data.

Alarm Interrupt Output Timing