S35390A datasheet(21/51 Pages) SII

21 / 51 page

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

Rev.2.2_00

S-35390A H Series

Seiko Instruments Inc.



Correction of Nonexistent Data and End-of-Month

When users write the real-time data, the S-35390A H Series checks it. In case that the data is invalid, the S-35390A H

Series does the following procedures.

1. Processing of nonexistent data

Table 13 Processing of Nonexistent Data

Normal Data

Nonexistent Data

Result

Year data

00 to 99

XA to XF, AX to FX

Month data

01 to 12

00, 13 to 19, XA to XF

Day data

01 to 31

00, 32 to 39, XA to XF

Day of the week data

0 to 6

Hour data

24-hour

0 to 23

24 to 29, 3X, XA to XF

12-hour

0 to 11

12 to 20, XA to XF

Minute data

00 to 59

60 to 79, XA to XF

Second data

00 to 59

60 to 79, XA to XF

*1.

In 12-hour mode, write the

flag (B1 in hour data in the real-time data register).

In 24-hour mode, the

flag in the real-time data register is omitted. However in the flag of reading, users are

able to read 0; 0 to 11, 1; 12 to 23.

*2.

Processing of nonexistent data, regarding second data, is done by a carry pulse which is generated in 1 second, after

writing. At this point the carry pulse is sent to the minute-counter.

2. Correction of end-of-month

A nonexistent day, such as February 30 and April 31, is set to the first day of the next month.

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