S35390A datasheet(15/51 Pages) SII

15 / 51 page

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK

Rev.2.2_00

S-35390A H Series

Seiko Instruments Inc.

4. INT1 register and INT2 register

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 interrupt by status

and INT2 pin,

a clock pulse and alarm interrupt are output.

4. 1 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.

A1mE

H20

H10

m10 m20 m40

A2mE

H20

H10

m10 m20 m40

AM /

A1WE

INT1 register

INT2 register

A2WE

A1HE

A2HE

AM /

Figure 13 INT1 Register and INT2 Register (Alarm-Time Data)

The INT1 register has A1WE, A1HE, 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 corresponding byte; by setting these bits to "1". This is as well in A2WE,

A2HE, A2mE in the INT2 register.

Setting example: alarm time "7:00 pm" in the INT1 register

(1) 12-hour mode (status register 1 B6 = 0)

Set up 7:00 PM

Data written to INT1 register

Day of the week

−

Hour

Minute

*1.

Don't care (both of 0 and 1 are acceptable).

(2) 24-hour mode (status register 1 B6 = 1)

Set up 19:00 PM

Data written to INT1 register

Day of the week

−

Hour

Minute

*1.

Don't care (both of 0 and 1 are acceptable).

*2.

Set up the

flag along with the time setting.

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