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PT7C4372A Datasheet, PDF (16/30 Pages) Pericom Semiconductor Corporation – Real-time Clock Module
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PT7C4372A/4372C
Real-time Clock Module (I2C Bus)
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 AAFG, BAFG:
These bits are valid only when the AALE, BALE bits value are "1". When a match occurs between the Alarm A or Alarm B
setting and the current time, the AAFG or BAFG bit value becomes "1" approximately 61 µs afterward. (There is no effect when
the AALE or BALE bit becomes "0".) The /INTB or /INTA = "L" status that is set at this time can be set to OFF by writing a "0"
to these bits.
AAFG,BAFG Data
Description
Read
0 Alarm register does not match current time
1 Alarm register match current time
Default
Write
0 /INTA or /INTB pin = OFF (H)
1 Setting prohibited
Default
 SL2, SL1:
Interrupt output select bits. Two alarm pulses (Alarm_A and alarm_B), periodic interrupt output (INT), 32kHz clock pulses may
be output to the /INTA or /INTB pins selectively by SL1 and SL2.
SL2 SL1
Description
0
0 Output Alarm_A, Alarm_B, INT to the /INTA. Output 32kHz clock pulses to /INTB.
Default
0
1 Output Alarm_A, INT to the /INTA. Output 32kHz clock pulses, Alarm_B to /INTB.
1
0 Output Alarm_A, Alarm_B to the /INTA. Output 32kHz clock pulses, INT to /INTB.
1
1 Output Alarm_A to the /INTA. Output 32kHz clock pulses, Alarm_B, INT to /INTB.
 /12, 24:
This bit is used to select between 12-hour clock operation and 24-hour clock operation.
12/24
Description
Time
0 12-hour time display
1 24-hour time display
24-hour clock
00
01
02
03
04
05
06
07
08
09
10
11
12-hour clock
12 ( AM 12)
01 ( AM 01 )
02 ( AM 02 )
03 ( AM 03 )
04 ( AM 04 )
05 ( AM 05 )
06 ( AM 06 )
07 ( AM 07 )
08 ( AM 08 )
09 ( AM 09 )
10 ( AM 10 )
11 ( 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
32 ( PM 12 )
21 ( PM 01 )
22 ( PM 02 )
23 ( PM 03 )
24 ( PM 04 )
25 ( PM 05 )
26 ( PM 06 )
27 ( PM 07 )
28 ( PM 08 )
29 ( PM 09 )
30 ( PM 10 )
31 ( PM 11 )
12-07-0001
PT0150-8 07/04/12
16
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