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BQ32002

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SLUSA96B – AUGUST 2010 – REVISED APRIL 2016

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Copyright © 2010–2016, Texas Instruments Incorporated

7.6.2 Normal Register Descriptions

Table 4. SECONDS Register

Address

0x00

Name

SECONDS

Initial Value

0XXXXXXb

Description

Clock seconds and STOP bit

D7

D6

D5

D4

D3

D2

D1

D0

BIT(S)

STOP

10_SECOND

1_SECOND

Name

r/w

r/w

r/w

Read/Write

0

X

X

X

X

X

X

X

Initial

UC

UC

UC

UC

UC

UC

UC

UC

Cycle

STOP

Oscillator stop. The STOP bit is used to force the oscillator to stop oscillating. STOP is set to 0 on initial application of

power, on all subsequent power cycles STOP remains unchanged. On initial power application STOP can be written to 1

and then written to 0 to force start the oscillator.

0

Normal

1

Stop

10_SECOND

BCD of tens of seconds. The 10_SECOND bits are the BCD representation of the number of tens of seconds on the

clock. Valid values are 0 to 5. If invalid data is written to 10_SECOND, the clock will update with invalid data in

10_SECOND until the counter rolls over; thereafter, the data in 10_SECOND is valid. Time keeping registers can take up

to 1 second to update after the RTC switches from backup power supply to main power supply.

1_SECOND

BCD of seconds. The 1_SECOND bits are the BCD representation of the number of seconds on the clock. Valid values

are 0 to 9. If invalid data is written to 1_SECOND, the clock will update with invalid data in 1_SECOND until the counter

rolls over; thereafter, the data in 1_SECOND is valid. Time keeping registers can take up to 1 second to update after the

RTC switches from backup power supply to main power supply.

Table 5. MINUTES Register

Address

0x01

Name

MINUTES

Initial Value

1XXXXXXb

Description

Clock minutes

D7

D6

D5

D4

D3

D2

D1

D0

BIT(S)

OF

10_MINUTE

1_MINUTE

Name

r/w

r/w

r/w

Read/Write

1

X

X

X

X

X

X

X

Initial

0

UC

UC

UC

UC

UC

UC

UC

Cycle

OF

Oscillator fail flag. The OF bit is a latched flag indicating when the 32.768-kHz oscillator has dropped at least four

consecutive pulses. The OF flag is always set on initial power-up, and it can be cleared through the serial interface.

When OF is 0, no oscillator failure has been detected. When OF is 1, the oscillator fail detect circuit has detected at least

four consecutive dropped pulses.

0

No failure detected

1

Failure detected

10_MINUTE

BCD of tens of minutes. The 10_MINUTE bits are the BCD representation of the number of tens of minutes on the clock.

Valid values are 0 to 5. If invalid data is written to 10_MINUTE, the clock will update with invalid data in 10_MINUTE until

the counter rolls over; thereafter, the data in 10_MINUTE is valid. Time keeping registers can take up to 1 second to

update after the RTC switches from backup power supply to main power supply.

1_MINUTE

BCD of minutes. The 1_MINUTE bits are the BCD representation of the number of minutes on the clock. Valid values are

0 to 9. If invalid data is written to 1_MINUTE, the clock will update with invalid data in 1_MINUTE until the counter rolls

over; thereafter, the data in 1_MINUTE is valid. Time keeping registers can take up to 1 second to update after the RTC

switches from backup power supply to main power supply.