PT7C43390 Datasheet, PDF (12/38 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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PT7C43390/43390C
Real-time Clock Module
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*1. Don't care (both of 0 and 1 are acceptable).
B4: 32kE, B5: INT1AE, B6: INT1ME, B7: INT1FE
These bits are used to select the output mode for the INT1 pin. Below Table shows how to select the mode. To use alarm 1
interrupt, access the INT1 register after setting the alarm interrupt mode.
Table: Output Modes for INT1 Pin
*1. Don't care (both of 0 and 1 are acceptable).
3.4. INT Register 1 and INT Register 2
The INT1 and INT2 registers are to set up the output of user-set frequency, or to set up alarm interrupt. Users are able to switch
the output mode by using the status register 2. If selecting to use the output mode for alarm interrupts by status register 2; these
registers work as alarm-time data registers. If selecting the output of user-set frequency by status register 2; these registers work as
data registers to set the frequency for clock output. From each INT1 and INT2 pin, a clock pulse and alarm interrupt are output.
a. Alarm interrupt
Users can set the alarm time (the data of day of the week, hour, minute) by using the INT1 and INT2 registers which are 3-byte
data registers. The configuration of register is as well as the data register of day of the week, hour, minute, in the real-time data
register; is expressed by the BCD code. Do not set a nonexistent day. Users are necessary to set up the alarm-time data according
to the 12 / 24 hour mode that they set by using the status register 1.
INT Register 1 and INT Register 2 (Alarm-Time Data)
The INT register 1 has A1WE, A1HE, and A1mE at B0 in each byte. It is possible to make data valid; the data of day of the week,
hour, minute which are in the corresponded byte; by setting these bits to "1". This is as well in A2WE, A2HE, and A2mE in the
INT register 2.
Setting example: alarm time "7:00 pm" in the INT register 1
2015-12-0001
PT0280-8 12/11/15
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