PT7C4372A Datasheet, PDF (11/30 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4372A/4372C
Real-time Clock Module (I²C Bus)
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 AAFG, BAFG
AAFG,BAFG Data
0
Read
1
Description
Alarm register does not match current time
Alarm register match current time
Default
Write
0 /INTA or /INTB pin = OFF (H)
1 Setting prohibited
See section “Alarm Function” for more detail.
Time Counter
Default
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
0
Seconds
(default)
-
S40
S20
S10
S8
S4
S2
S1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
1
Minutes
(default)
-
M40
M20
M10
M8
M4
M2
M1
0
Undefined Undefined Undefined Undefined Undefined Undefined Undefined
2
Hours
-
- H20 or P,/A H10
H8
H4
H2
H1
(default)
0
0
Undefined Undefined Undefined Undefined Undefined Undefined
Note: Any registered imaginary time should be replaced with correct time; otherwise it will cause the clock counter malfunction.
Days of the week Counter
Addr. Description
D7
D6
D5
D4
3 ^{Days of the week}
-
-
-
-
(default)
0
0
0
0
“-“ indicates write-protected bits. A zero is always read from these bits.
D3
D2
D1
D0
-
W4
W2
W1
0
Undefined Undefined Undefined
The day counter is a divide-by-7 counter that counts from 00 to 01 and up 06 before starting again from 01.
The correspondence between days and count values is shown below.
Days
W4
W2
W1
Day
Remark
0
0
0
Sunday
00 h
0
0
1
Monday
01 h
0
1
0
Tuesday
02 h
Write / Read
0
1
1
Wednesday 03 h
1
0
0
Thursday
04 h
1
0
1
Friday
05 h
1
1
0
Saturday
06 h
Write prohibit
1
1
1
-
Do not enter a setting for this bit.
12-07-0001
PT0150-8 07/04/12
11