BQ3285E datasheet(9/36 Pages) TI1

9 / 36 page

Update cycle transfer operation

Square-wave output

Interrupt events

Daylight saving adjustment

Clock and calendar data formats

All bits of register B are read/write.

DSE - Daylight Saving Enable

This bit enables daylight-saving time adjustments when

written to 1:

On the last Sunday in October, the first time the

bq3285E/L increments past 1:59:59 AM, the time

falls back to 1:00:00 AM.

On the first Sunday in April, the time springs

forward from 2:00:00 AM to 3:00:00 AM.

HF - Hour Format

This bit selects the time-of-day and alarm hour format:

1 = 24-hour format

0 = 12-hour format

DF - Data Format

This bit selects the numeric format in which the time,

alarm, and calendar bytes are represented:

1 = Binary

0 = BCD

SQWE - Square-Wave Enable

This bit enables the square-wave output:

1 = Enabled

0 = Disabled and held low

UIE - Update Cycle Interrupt Enable

This bit enables an interrupt request due to an update

ended interrupt event:

1 = Enabled

0 = Disabled

The UIE bit is automatically cleared when the UTI bit

equals 1.

AIE - Alarm Interrupt Enable

This bit enables an interrupt request due to an alarm

interrupt event:

1 = Enabled

0 = Disabled

PIE - Periodic Interrupt Enable

This bit enables an interrupt request due to a periodic

interrupt event:

1 = Enabled

0 = Disabled

7654

210

----

DSE

7654

210

----

7654

210

----

7654

210

----

SQWE

7654

210

---

UIE

---

7654

210

UTI

PIE

AIE

UIE SQWE

DSE

7654

210

AIE

---

7654

210

PIE

---

bq3285E/L

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