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參數(shù)資料
| 型號(hào)： | BQ3285LP |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實(shí)時(shí)時(shí)鐘 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 831K |
| 代理商： | BQ3285LP |
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32kHz Output
The bq3285EC/LC provides for a 32.768kHz output. For
the bq3285EC, the output is always active whenever V
CC
is valid (V
PFD
+ t
CSR
). The bq3285EC output is not af-
fected by the bit settings in Register A. Time-keeping
aspects, however, still require setting OS0-OS2.
bq3285LC output is active when the oscillator is turned
on by setting theOSC0-OSC2 bits in Register A.
The
Interrupts
The bq3285EC/LC allows three individually selected in-
terrupt events to generate an interrupt request. These
threeinterrupt events are:
n
The periodic interrupt, programmable to occur once
every 122
μ
s to500ms.
n
The alarm interrupt, programmable to occur once per
second to once per day, is active in battery-backup
mode, providing a “wake-up” feature.
n
The update-ended interrupt, which occurs at the end
of each updatecycle.
Each of the three interrupt events is enabled by an indi-
vidual interrupt-enable bit in register B. When an event
occurs, its event flag bit in register C is set. If the corre-
sponding event enable bit is also set, then an interrupt
request is generated.
The interrupt request flag bit
(INTF) of register C is set with every interrupt request.
Reading register C clears all flag bits, including INTF,
and makes INT high-impedance.
Two methods can be used to process bq3285EC/LC in-
terrupt events:
n
Enable interrupt
request output to invoke an interrupt service routine.
events and use the interrupt
n
Do not enable the interrupts and use a polling
routine to periodically check the status of the flag
bits.
The individual interrupt sources are described in detail
in thefollowing sections.
6
bq3285EC/LC
Register A Bits
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Periodic Interrupt
Period
None
3.90625
7.8125
122.070
244.141
488.281
976.5625
1.95315
3.90625
7.8125
15.625
31.25
62.5
125
250
500
same as above defined
by RS3–RS0
OSC2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OSC1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
OSC0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
RS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
RS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Units
ms
ms
μ
s
μ
s
μ
s
μ
s
ms
ms
ms
ms
ms
ms
ms
ms
ms
0
1
1
X
X
X
X
Table 3. Periodic Interrupt Rate
July 1996
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| BQ3285LP- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285LPN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285LQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| BQ3285LQ- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285LQN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC |
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