S-35390A Seiko Instruments, S-35390A Datasheet - Page 18

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

18
2-WIRE REAL-TIME CLOCK
S-35390A
Processing of Nonexistent Data and End-of-Month
month is corrected.
1. Processing of nonexistent data
When real-time data is written, the data is checked for validity, invalid data is processed, and the end-of-
2. Processing of end-of-month
*1. For 12-hour expression, write the AM/PM flag.
*2. Processing of nonexistent data for second data is performed by a carry pulse one second
Year data
Month data
Day data
Day of week data
Minute data
Second data
Hour data
A nonexistent day is set to the first day of the next month. If February 30th is written, March 1st is
set. Leap year correction is also performed at this time.
The AM/PM flag is ignored in 24-hour expression, but “0” for 0 to 11 hours and “1” for 12 to
23 hours are read in a read operation.
after the end of writing. At this point, the carry pulse is sent to the minute counter.
Register
*1
(24-hour)
(12-hour)
*2
Table 12 Processing of Nonexistent Data
Normal Data
00 to 99
01 to 12
01 to 31
00 to 59
00 to 59
0 to 23
0 to 11
0 to 6
Seiko Instruments Inc.
12 to 19, 2X, 3X, XA to XF
24 to 29, 3X, XA to XF
00, 13 to 19, XA to XF
00, 32 to 39, XA to XF
XA to XF, AX to FX
60 to 79, XA to XF
60 to 79, XA to XF
Error Data
7
Result
00
01
01
00
00
00
00
0
Rev.1.2
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