BQ3285ESS datasheet(5/29 Pages) TI

5 / 29 page

Programming the RTC

The time-of-day, alarm, and calendar bytes can be writ-

ten in either the BCD or binary format (see Table 2).

These steps may be followed to program the time, alarm,

and calendar:

Modify the contents of register B:

Write a 1 to the UTI bit to prevent trans-

fers between RTC bytes and user buffer.

Write the appropriate value to the data

format (DF) bit to select BCD or binary

format for all time, alarm, and calendar

bytes.

Write the appropriate value to the hour

format (HF) bit.

Write new values to all the time, alarm, and

calendar locations.

Clear the UTI bit to allow update transfers.

On the next update cycle, the RTC updates all 10 bytes

in the selected format.

Address

RTC Bytes

Range

Decimal

Binary

Binary-Coded

Decimal

Seconds

0–59

00H–3BH

00H–59H

Seconds alarm

0–59

00H–3BH

00H–59H

Minutes

0–59

00H–3BH

00H–59H

Minutes alarm

0–59

00H–3BH

00H–59H

Hours, 12-hour format

1–12

01H–OCH AM;

81H–8CH PM

01H–12H AM;

81H–92H PM

Hours, 24-hour format

0–23

00H–17H

00H–23H

Hours alarm, 12-hour format

1–12

01H–OCH AM;

81H–8CH PM

01H–12H AM;

81H–92H PM

Hours alarm, 24-hour format

0–23

00H–17H

00H–23H

Day of week (1=Sunday)

1–7

01H–07H

Day of month

1–31

01H–1FH

01H–31H

Month

1–12

01H–0CH

01H–12H

Year

0–99

00H–63H

00H–99H

Table 2. Time, Alarm, and Calendar Formats

bq3285E/L

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