PT7C4339 Datasheet, PDF (12/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4339/4339C
Real-time Clock Module
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4.5. 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.
Addr.
Description
D7
D6
D5
D4
D3
D2
D1
D0
(hex)
04
Dates
0
0
D20
D10
D8
D4
D2
D1
(default)
0
0
Undefined Undefined Undefined Undefined Undefined Undefined
05
Months
Century^*1
0
(default)
Undefined
0
0
M10
M8
M4
M2
M1
0
Undefined Undefined Undefined Undefined Undefined
06
Years
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
*1: The century bit is toggled when the years register overflows from 99 to 00.
4.6. Alarm Register
Alarm 1, Alarm 2 Register
Addr. Description
D7
D6
D5
D4
D3
D2
D1
D0
07 ^{Alarm 1: Seconds A1M1*1}
S40
S20
S10
S8
S4
S2
S1
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
Alarm 1: Minutes A1M2^*1 M40
M20
M10
M8
M4
M2
M1
08
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
09 ^{Alarm 1: Hours}
(default)
A1M3^*1 12, /24 H20 or P,/A H10
H8
H4
H2
H1
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
Alarm 1: Day, Date A1M4^*1
0A
Day,
/Date^*1
0,
D20
0,
D10
0,
D8
W4,
W2,
W1,
D4
D2
D1
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
Alarm 2: Minutes A2M2^*2 M40
M20
M10
M8
M4
M2
M1
0B
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
0C ^{Alarm 2: Hours}
(default)
A2M3^*2 12, /24 H20 or P,/A
Undefined Undefined Undefined
Alarm 2: Day, Date A2M4^*2
0D
Day,
/Date^*2
0,
D20
(default)
Undefined Undefined Undefined
*1 Note: Alarm mask bit, using to select Alarm 1 alarm rate.
*2 Note: Alarm mask bit, using to select Alarm 2 alarm rate.
H10
H8
H4
H2
H1
Undefined Undefined Undefined Undefined Undefined
0,
0,
W4,
W2,
W1,
D10
D8
D4
D2
D1
Undefined Undefined Undefined Undefined Undefined
2015-08-0008
PT0508-1 08/24/15
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