PT7C4302_15 Datasheet, PDF (8/14 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (3-wire Interface)

PT7C4302
Real-time Clock Module (3-wire Interface)
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2. Control and status register
Addr.
Description
D7
D6
D5
D4
D3
D2
D1
D0
(hex)
07
Control
WP
0
0
0
0
0
0
0
(default)
0
0
0
0
0
0
0
0
WP: Write Protect bit.
WP
Data
0
Read / Write
1
Description
Write operation is enabled.
Prevent a write operation to any other register.
Default
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
/EOSC^*
S40
S20
S10
S8
S4
S2
S1
(default)
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
12, /24
0 H20 or P,/A H10
H8
H4
H2
H1
(default)
Undefined
0
Undefined Undefined Undefined Undefined Undefined Undefined
* Note: /EOSC bit must be written into 0 to start the time count.
a) 12 / 24 bit
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
92 ( AM 12)
81 ( AM 01 )
82 ( AM 02 )
83 ( AM 03 )
84 ( AM 04 )
85 ( AM 05 )
86 ( AM 06 )
87 ( AM 07 )
88 ( AM 08 )
89 ( AM 09 )
90 ( AM 10 )
91 ( 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.
12-hour clock
B2 ( PM 12 )
A1 ( PM 01 )
A2 ( PM 02 )
A3 ( PM 03 )
A4 ( PM 04 )
A5 ( PM 05 )
A6 ( PM 06 )
A7 ( PM 07 )
A8 ( PM 08 )
A9 ( PM 09 )
B0 ( PM 10 )
B1 ( PM 11 )
2015-11-0004
PT0225-6 11/25/15
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