BQ32002 Datasheet, PDF (14/29 Pages) Texas Instruments – BQ32002 Real-Time Clock (RTC)

BQ32002
SLUSA96B – AUGUST 2010 – REVISED APRIL 2016
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Address
Name
Initial Value
Description
D7
CENT_EN
r/w
X
UC
CENT_EN
CENT
10_HOUR
1_HOUR
Address
Name
Initial Value
Description
D7
0
0
RSVD
DAY
Table 6. CENT_HOURS Register
0x02
CENT_HOURS
XXXXXXXXb
Clock hours, century, and CENT_EN bit
D6
D5
D4
D3
D2
D1
D0
BIT(S)
CENT
10_HOUR
1_HOUR
Name
r/w
r/w
r/w
Read/Write
X
X
X
X
X
X
X
Initial
UC
UC
UC
UC
UC
UC
UC
Cycle
Century enable. The CENT_EN bit enables the century timekeeping feature. If CENT_EN is set to 1, then the clock
tracks the century using the CENT bit. If CENT_EN is set to 0, the clock ignores the CENT bit.
0
Century disabled
1
Century enabled
Century. The CENT bit tracks the century when century timekeeping is enabled. The clock toggles the CENT bit when
the year count rolls from 99 to 00. Because the clock compliments the CENT bit, the user can define the meaning of
CENT (1 for current century and 0 for next century, or 0 for current century and 1 for next century).
BCD of tens of hours (24-hour format). The 10_HOUR bits are the BCD representation of the number of tens of hours on
the clock, in 24-hour format. Valid values are 0 to 2. If invalid data is written to 10_HOUR, the clock will update with
invalid data in 10_HOUR until the counter rolls over; thereafter, the data in 10_HOUR 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.
BCD of hours (24-hour format). The 1_HOUR bits are the BCD representation of the number of hours on the clock, in 24-
hour format. Valid values are 0 to 9. If invalid data is written to 1_HOUR, the clock will update with invalid data in
1_HOUR until the counter rolls over; thereafter, the data in 1_HOUR 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 7. DAY Register
0x03
DAY
00000XXXb
Clock day
D6
D5
D4
D3
D2
D1
D0
BIT(S)
RSVD
DAY
Name
r/w
r/w
Read/Write
0
0
0
0
X
X
X
Initial
0
0
0
0
UC
UC
UC
Cycle
Reserved. The RSVD bits should always be written as 0.
BCD of the day of the week. The DAY bits are the BCD representation of the day of the week. Valid values are 1 to 7
and represent the days from Sunday to Saturday. DAY updates if set to 0 until the counter rolls over; thereafter, the data
in DAY 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
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
14
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