PT7C4302 Datasheet, PDF (6/16 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (3-wire Interface)

Data Sheet
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)
1
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.
PT0225(11/05)
6
Ver: 0