bq3285
SQWE - Square-Wave Enable
Register B
7
-
6
-
5
-
4
-
3
2
-
1
-
0
-
Register B Bits
SQWE
7
6
5
4
3
2
1
0
UTI PIE AIE UIE SQWE DF
HF DSE
This bit enables the square-wave output:
1 = Enabled
Register B enables:
0 = Disabled and held low
n
n
n
n
Update cycle transfer operation
Square-wave output
UIE - Update Cycle Interrupt Enable
Interrupt events
7
-
6
-
5
-
4
3
-
2
-
1
-
0
-
Daylight saving adjustment
UIE
Register B selects:
Clock and calendar data formats
This bit enables an interrupt request due to an update
ended interrupt event:
n
All bits of register B are read/write.
1 = Enabled
0 = Disabled
DSE - Daylight Saving Enable
The UIE bit is automatically cleared when the UTI bit
equals 1.
7
-
6
-
5
-
4
-
3
-
2
-
1
-
0
DSE
AIE - Alarm Interrupt Enable
This bit enables daylight-saving time adjustments when
written to 1:
This bit enables an interrupt request due to an alarm
7
6
5
4
3
2
1
0
n
On the last Sunday in October, the first time the
bq3285 increments past 1:59:59 AM, the time falls
back to 1:00:00 AM.
-
-
AIE
-
-
-
-
-
interrupt event:
1 = Enabled
n
On the first Sunday in April, the time springs
forward from 2:00:00 AM to 3:00:00 AM.
0 = Disabled
HF - Hour Format
PIE - Periodic Interrupt Enable
This bit enables an interrupt request due to a periodic
7
-
6
-
5
-
4
-
3
-
2
-
1
0
-
HF
7
-
6
5
-
4
-
3
-
2
-
1
-
0
-
This bit selects the time-of-day and alarm hour format:
1 = 24-hour format
PIE
0 = 12-hour format
interrupt event:
1 = Enabled
DF - Data Format
0 = Disabled
7
-
6
-
5
-
4
-
3
-
2
1
-
0
-
DF
This bit selects the numeric format in which the time,
alarm, and calendar bytes are represented:
1 = Binary
0 = BCD
Jan. 1999 E
9
TI [ TEXAS INSTRUMENTS ]
