PT7C4337A Datasheet, PDF (11/25 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4337A/4337AC
Real-time Clock Module (I²C Bus)
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 A2F
A1F
Read /
Write
Read
Alarm 2 Flag.
Data
Description
0 The time do not match the alarm 2 registers.
Default
Indicates that the time matched the alarm 1 registers. This flag can be used to generate an interrupt on
either INTA or SQW/INTB depending on the status of the INTCN bit. If the INTCN = 0 and A2F = 1
1 (and A2IE = 1), the INTA pin goes low. If the INTCN = 1 and A2F = 1 (and A2IE = 1), the
SQW/INTB pin goes low. A2F is cleared when written to logic 0. Attempting to write to logic 1 leaves
the value unchanged.
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
0
0
0
0
0
0
0
01
Minutes
(default)
0
M40
M20
M10
M8
M4
M2
M1
0
0
0
0
0
0
0
0
02
Hours
(default)
0
12, /24 H20 or P,/A H10
H8
H4
H2
H1
0
0
0
0
0
0
0
0
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
2014-10-0002
PT0480-2 11/03/14
11