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PT7C4307_13 Datasheet, PDF (9/15 Pages) Pericom Semiconductor Corporation – Real-time Clock Module
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PT7C4307
Real-time Clock Module (I2C Bus)
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 12, /24 bit
This bit is used to select between 12-hour clock system and 24-hour clock system.
12, /24
Data
Description
Read / Write
0
24-hour system
1
12-hour system
This bit is used to select between 12-hour clock operation and 24-hour clock operation.
12, /24
Description
Hours register
0 24-hour time display
1 12-hour time display
24-hour clock
00
01
02
03
04
05
06
07
08
09
10
11
12-hour clock
52 ( AM 12 )
41 ( AM 01 )
42 ( AM 02 )
43 ( AM 03 )
44 ( AM 04 )
45 ( AM 05 )
46 ( AM 06 )
47 ( AM 07 )
48 ( AM 08 )
49 ( AM 09 )
50 ( AM 10 )
51 ( AM 11 )
24-hour clock
12
13
14
15
16
17
18
19
20
21
22
23
* Be sure to select between 12-hour and 24-hour clock operation before writing the time data.
Days of the week Counter
12-hour clock
72 ( PM 12)
61 ( PM 01 )
62 ( PM 02 )
63 ( PM 03 )
64 ( PM 04 )
65 ( PM 05 )
66 ( PM 06 )
67 ( PM 07 )
68 ( PM 08 )
69 ( PM 09 )
70 ( PM 10 )
71 ( PM 11 )
The day counter is a divide-by-7 counter that counts from 01 to 07 and up 07 before starting again from 01. Values that
correspond to the day of week are user defined but must be sequential (i.e., if 1 equals Sunday, then 2 equals Monday, and so on).
Illogical time and date entries result in undefined operation.
Addr.
Description
D7
D6
D5
D4
D3
D2
D1
D0
(hex)
03 Days of the week
0
0
0
(default)
0
0
0
0
0
W4
W2
W1
0
0
Undefined Undefined Undefined
Calendar Counter
The data format is BCD format.
 Day digits: Range from 1 to 31 (for January, March, May, July, August, October and December).
Range from 1 to 30 (for April, June, September and November).
Range from 1 to 29 (for February in leap years).
Range from 1 to 28 (for February in ordinary years).
Carried to month digits when cycled to 1.
 Month digits: Range from 1 to 12 and carried to year digits when cycled to 1.
 Year digits: Range from 00 to 99 and 00, 04, 08, … , 92 and 96 are counted as leap years.
2013-06-0002
PT0206-5 06/18/13
9
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