S-35392A Datasheet, PDF (20/47 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

2-WIRE REAL-TIME CLOCK
S-35392A
Rev.1.3_00
„ Correction of Nonexistent Data and End-of-Month
When users write the real-time data, the S-35392A checks it. In case that the data is invalid, the S-35392A does the
following procedures.
1. Processing of nonexistent data
Table 11 Processing of Nonexistent Data
Register
Year data
Month data
Day data
Day of the week data
Hour data ^{*1 24-hour}
12-hour
Minute data
Second data ^*2
Normal Data
00 to 99
01 to 12
01 to 31
0 to 6
0 to 23
0 to 11
00 to 59
00 to 59
Nonexistent Data
XA to XF, AX to FX
00, 13 to 19, XA to XF
00, 32 to 39, XA to XF
7
24 to 29, 3X, XA to XF
12 to 19, 2X, 3X, XA to XF
60 to 79, XA to XF
60 to 79, XA to XF
Result
00
01
01
0
00
00
00
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.