PT7C4339 Datasheet, PDF (11/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4339/4339C
Real-time Clock Module
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4.3. Time Counter
Time digit display (in BCD code):
 Second digits: Range from 00 to 59 and carried to minute digits when incremented from 59 to 00.
 Minute digits: Range from 00 to 59 and carried to hour digits when incremented from 59 to 00.
 Hour digits: See description on the /12, 24 bit. Carried to day and day-of-the-week digits when incremented from 11 p.m. to
12 a.m. or 23 to 00.
Addr.
Description
D7
D6
D5
D4
D3
D2
D1
D0
(hex)
00
Seconds
(default)
0
S40
S20
S10
S8
S4
S2
S1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
01
Minutes
(default)
0
M40
M20
M10
M8
M4
M2
M1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
02
Hours
(default)
0
12, /24 H20 or P,/A H10
H8
H4
H2
H1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
Note: Any registered imaginary time should be replaced with correct time, otherwise it will cause the clock counter malfunction.
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
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 )
* Be sure to select between 12-hour and 24-hour clock operation before writing the time data.
4.4. Days of the week Counter
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
2015-08-0008
PT0508-1 08/24/15
11