PT7C4363 Datasheet, PDF (6/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (I2C Bus)

Data Sheet
PT7C4363
Real-time Clock Module (I²C Bus)
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2. Control and status register
Addr.
(hex)
00
01
0D
0E
0F
Description
Control/status 1
(default)
Control/status 2
(default)
SQW control
(default)
Timer control
(default)
Timer
(default)
D7
D6
D5
D4
D3
D2
D1
D0
TEST1
0
-
STOP
Undefined
0
-
TESTC
-
-
-
Undefined
1
Undefined Undefined Undefined
-
-
-
TI/TP
AF
TF
AIE
TIE
Undefined Undefined Undefined
0
Undefined Undefined
0
0
SQWE
×
×
×
×
×
RS1
RS0
1
Undefined Undefined Undefined Undefined Undefined
0
0
TE
×
×
×
×
×
TD1
TD0
0
Undefined Undefined Undefined Undefined Undefined
1
1
Timer count down value
Undefined
a) Timer
• TE: Timer Enable bit.
TE
Data
0
Read / Write
1
Timer disabled
Timer enabled
Description
Default
• TD1, TD0: timer source clock frequency select. These bits determine the source clock for the countdown timer.
TD1, TD0
Data
Timer source clock freq. (Hz)
00 4.096k
Read / Write
01 64
10 1
11 1/60
When not in use, TD1 TD0 should be set to 11 for power saving.
• Timer:
Timer
Read / Write
Data
00~FF _{Count down value (n)}
Description
Countdown Period = n / Source Clock Frequency
For example: If TE = 1, TD1 TD0 = 10, Timer = 03 are written into PT7C4363, timer counts down every 1 second from 03 to 01
then 03 cycled.
PT0207(07/05)
6
Ver: 0