S-35390A Datasheet, PDF (20/54 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35390A
Rev.2.4_00
„ Correction of Nonexistent Data and End-of-Month
When users write the real-time data, the S-35390A checks it. In case that the data is invalid, the S-35390A does the
following procedures.
1. Processing of nonexistent data
Table 12 Processing of Nonexistent Data
Register
Normal Data
Nonexistent Data
Result
Year data
00 to 99
XA to XF, AX to FX
00
Month data
01 to 12
00, 13 to 19, XA to XF
01
Day data
01 to 31
00, 32 to 39, XA to XF
01
Day of the week data
0 to 6
7
0
Hour data ^{*1 24-hour}
0 to 23
24 to 29, 3X, XA to XF
00
12-hour
0 to 11
12 to 19, 2X, 3X, XA to XF
00
Minute data
00 to 59
60 to 79, XA to XF
00
Second data ^*2
00 to 59
60 to 79, XA to XF
00
*1. In a 12-hour expression, Write the AM/PM flag (B1 in hour data in the real-time data register).
In 24-hour expression, the AM/PM flag in the real-time data register is omitted. However in the flag in Read, 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 one sec after, after
Write. 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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Seiko Instruments Inc.