S35390A datasheet(25/51 Pages) SII

25 / 51 page

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

Rev.2.2_00

S-35390A H Series

Seiko Instruments Inc.

5. Minute-periodical interrupt output 2 (only in the

INT

pin output mode)

The output of minute-periodical interrupt 2 is the function to output "L", for 7.81 ms, from the

INT

pin, synchronizing

with the first minute-carry processing after selecting the output mode. However, during a reading operation in the

real-time data register, the procedure delays at 0.5 seconds max. thus output "L" from the

INT

pin also delays at 0.5

seconds max. During a writing operation in the real-time data register, some delay is made in the output period due to

write timing and the second-data of writing.

(1) During normal operation

7.81 ms

60 s

INT1 pin

Minute-carry processing

(2) During reading operation in the real-time data register

7.81 ms

INT1 pin

Serial

communication

0.5 s max.

60 s

Real-time data

read command

Real-time

data reading

Real-time data

read command

Real-time

data reading

Minute-carry processing

(Normal minute-

carry processing)

(3) During writing operation in the real-time data register

7.81 ms

INT1 pin

Real-time data

write timing

55 s

80 s

Minute-carry processing

45 s

10 s

30 s

50 s

The output period is shorter.

The output period is longer.

Second data of writing: "50" s

Second data of writing: "10" s

Figure 29 Timing of Minute-periodical Interrupt Output 2

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