S35390A datasheet(23/51 Pages) SII

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

Rev.2.2_00

S-35390A H Series

Seiko Instruments Inc.

1. 2 Alarm setting of "H (hour)"

Comparator

OFF

INT1AE / INT2AE

INT1 pin / INT2 pin

Alarm interrupt

Second

Real-time data

Minute

INT1 register

INT2 register

Year

Hour

Day of

the week

Day Month

Change by program

Alarm time matches

Period when alarm time matches

Change by program

Real-time data

Alarm time

matches*2

01 s

59 s

H h 00 m 00 s

H h 59 m 59 s

H h 01 m 00 s

+ 1) h 00 m 00 s

− 1) h 59 m 59 s

Change by program

INTx register alarm enable flag

• AxHE = AxmE = AxWE = "1"

Status register 2 setting

• INT1 pin output mode

32kE = 0, INT1ME = INT1FE = 0

• INT2 pin output mode

INT2ME = INT2FE = 0

*1.

If users clear INT1AE / INT2AE once; "L" is not output from the

INT

pin by setting INT1AE / INT2AE enable

again, within a period when the alarm time matches real-time data.

*2.

If turning the alarm output on by changing the program, within the period when the alarm time matches real-time data,

"L" is output again from the

INT

pin when the minute is counted up.

Figure 25 Alarm Interrupt Output Timing

2. Output of user-set frequency

The output of user-set frequency is the function to output the frequency which is selected by using data, from the

INT

pin, in the AND-form. Set up the data of frequency in the INT1 / INT2 register.

Refer to "4. INT1 register and INT2 register" in " Configuration of Registers".

OFF

INT1FE / INT2FE

INT1 pin / INT2 pin

Change by program

Free-run output starts

Status register 2 setting

• INT1 pin output mode

32kE = 0, INT1AE = Don’t care (0 or 1), INT1ME = 0

• INT2 pin output mode

INT2AE = Don’t care (0 or 1), INT2ME = 0

Figure 26 Output Timing of User-set Frequency

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