PT7C43190 Datasheet, PDF (11/32 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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B2: SC3, B3: SC2
These are 2-bit SRAM type registers that can be freely set by users.
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B4: 32kE, B5: INT1AE, B6: INT1ME, B7: INT1FE
These bits are used to select the output mode for the INT pin. Below Table shows how to select the mode. To use alarm
1 interrupt, access the INT register 1 after setting the alarm 1 interrupt mode.
Table: Output Modes for INT Pin
*1. Don't care (both of 0 and 1 are acceptable).
3.4. INT Register 1 and INT Register 2
The INT register 1 is to set up the output of user-set frequency, or to set up alarm 1 interrupt. The INT register 2 is for setting
alarm 2 interrupt. Users are able to switch the output mode by using the status register 2. If selecting to use the output mode for
alarm interrupt by status register 2; this register works as the alarm-time data register. In the INT register 1, if selecting the output
of user-set frequency by status register 2; this register works as the data register to set the frequency for clock output. From the
INT pin, a clock pulse and alarm interrupt are output, according to the or-condition that these two registers have.
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
(1) 12-hour mode (status register 1 B6 = 0)
Set up 7:00 PM
Data written to INT register 1
2015-09-0015
PT0274-7 10/16/15
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