S35390A datasheet(34/51 Pages) SII

34 / 51 page

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

S-35390A H Series

Rev.2.2_00

Seiko Instruments Inc.

4. 4 INT1 register access and INT2 register access

In reading / writing the INT1 and INT2 registers, data varies depending on the setting of the status register 2. Be sure

to read / write after setting the status register 2. When setting the alarm by using the status register 2, these registers

work as 3-byte alarm time data registers, in other statuses, they work as 1-byte registers. When outputting the

user-set frequency, they are the data registers to set up the frequency.

Regarding details of each data, refer to "4. INT1 register and INT2 register" in " Configuration of Registers".

Caution Users cannot use both functions of alarm 1 interrupt and output of user-set frequency for the

INT

pin and

INT

pin simultaneously.

SCL

SDA

Day of the week

data

Minute data

R / W

I/O mode switching

Hour data

Device code

command

*1.

0: INT1 register selected, 1: INT2 register selected

*2.

Set NO_ACK = 1 when reading.

*3.

Transmit ACK = 0 from the master device to the S-35390A H Series when reading.

Figure 41 INT1 Register Access and INT2 Register Access

I/O mode switching

SCL

SDA

Frequency

setting data

I/O mode switching

R / W

Device code

command

*1.

0: INT1 register selected, 1: INT2 register selected

*2.

Set NO_ACK = 1 when reading.

Figure 42 INT1 Register and INT2 Register (Data Register for Output Frequency) Access

S35390A Datasheet(PDF) 34 Page - Seiko Instruments Inc

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