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PT7C4307_13 Datasheet, PDF (8/15 Pages) Pericom Semiconductor Corporation – Real-time Clock Module
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PT7C4307
Real-time Clock Module (I2C Bus)
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Control and status register
Addr.
Description
D7
D6
(hex)
07
Control
(default)
OUT
0
0
0
D5
D4
D3
0
SQWE
0
0
0
0
D2
D1
D0
0
RS1
RS0
0
1
1
 OUT
It controls the output level of the SQW/OUT pin when the square wave output is disabled.
OUT
Data
Description
Read / Write
0 When SQWE = 0, SQW/OUT pin output low.
1 When SQWE = 0, SQW/OUT pin output high.
Default
 SQWE (Square Wave Enable)
This bit, when set to a logic 1, will enable the oscillator output. The frequency of the square wave output depends upon the value
of the RS0 and RS1 bits. With the square wave output set to 1Hz, the clock registers update on the falling edge of the square wave.
 RS (Rate Select)
These bits control the frequency of the square wave output when the square wave output has been enabled.
RS1, RS0
Data
SQW output freq. (Hz)
00 1
Read / Write
01 4.096k
10 8.192k
11 32.768k
Default
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
(default)
0
12, /24 H20 or P,/A H10
H8
H4
H2
H1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
* Note: /EOSC bit must be written into 0 to start the time count.
2013-06-0002
PT0206-5 06/18/13
8
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