PT7C4372A Datasheet, PDF (15/30 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4372A/4372C
Real-time Clock Module (I²C Bus)
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Alarm Function
These part no have Alarm A and Alarm B functions which can all output alarm pulses at the preset days of the week, hours and
minutes.
Related register
Addr. Function
1 Minutes
2 Hours
3 Days of the week
8 Alarm_A: Minute
9 Alarm_A: Hour
A Alarm_A: Day
B Alarm_B: Minute
C Alarm_B: Hour
D Alarm_B: Day
E Control 1
F Control 2
Bit 7
-
-
-
-
-
-
-
-
-
AALE
-
Bit 6
M40
-
-
Bit 5
M20
H20 or
P, /A
-
Bit 4
M10
H10
-
AM40
-
AW6
AM20
AH20 or
AP, /A
AW5
AM10
AH10
AW4
BM40
-
BW6
BM20
BH20 or
BP, /A
BW5
BM10
BH10
BW4
BALE
-
SL2
/12, 24
SL1
ADJ or
XSTP
Bit 3
M8
H8
-
AM8
AH8
AW3
BM8
BH8
BW3
TEST
CLEN
Bit 2
M4
H4
W4
AM4
AH4
AW2
BM4
BH4
BW2
CT2
CTFG
Bit 1
M2
H2
W2
AM2
AH2
AW1
BM2
BH2
BW1
CT1
AAFG
Bit 0
M1
H1
W1
AM1
AH1
AW0
BM1
BH1
BW0
CT0
BAFG
 AALE, BALE:
This bit is used to set up the Alarm A/B function (to generate alarms matching day, hour, or minute settings).
AALE, BALE
Data
Description
Read / Write
0 Alarm_A (Alarm_B) correspondence action invalid
1 Alarm_A (Alarm_B) correspondence action valid
Default
* When using the Alarm A (or B) function, first set this AALE (or BALE) bit value as "0" to stop the function. Next, set the day,
hour, minute, and set the AAFG (or BAFG) bit to 0. Finally, set "1" to the AALE (or BALE) bit to set the Alarm A (or B) function
as valid. The reason for first setting the AALE (or BALE) bit value as "0" is to prevent /INTB or /INTA = "L" output in the event
that a match between the current time and alarm setting occurs while the alarm setting is still being made.
12-07-0001
PT0150-8 07/04/12
15