參數(shù)資料
型號(hào): LPC47U33x
廠商: SMSC Corporation
英文描述: 100 Pin Enhanced Super I/O for LPC Bus with Consumer Features and SMBus Controller
中文描述: 100引腳增強(qiáng)的超級(jí)I / LPC總線為O與消費(fèi)特點(diǎn)和SMBus控制器
文件頁(yè)數(shù): 16/252頁(yè)
文件大?。?/td> 1000K
代理商: LPC47U33X
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16
Indication of 32kHz Clock
There is a bit to indicate whether or not the
32kHz clock input is connected to the
LPC47U33x. This bit is located at bit 0 of the
CLOCKI32 register at 0xF0 in Logical Device A.
This register is powered by VTR and reset on a
VTR POR.
Bit[0] (CLK32_PRSN) is defined as follows:
0=32kHz clock is connected to the CLKI32 pin
(default) 1=32kHz clock is not connected to the
CLKI32 pin (pin is grounded externally).
Note: If the 32kHz clock is not connected to the
part, the CLKI32 pin must be grounded
Bit 0 controls the source of the 32kHz (nominal)
clock for the WDT, fan tachometer logic, LED
blink logic and “wake on specific key” logic.
When the external 32kHz clock is connected,
that will be the source for the WDT, fan
tachometer, LED and “wake on specific key”
logic. When the external 32kHz clock is not
connected, an internal 32kHz clock source will
be derived from the 14MHz clock for the WDT,
fan tachometer, LED and wake on specific key
logic.
The following functions will not work under VTR
power (VCC removed) if the external 32kHz
clock is not connected. These functions will
work under VCC power.
Wake on specific key
LED blink
WDT
FAN_TACH
Trickle Power Functionality
When the LPC47U33x is running under VTR
only, PME wakeup events can be generated if
enabled, causing the chip to assert the
nIO_PME pin. The following lists the wakeup
events:
UART Ring Indicator
Keyboard data
Mouse data
Wake on Specific Key Logic
Fan Tachometer (Note)
GPIOs for wakeup. See below.
Note. The Fan Tachometer can generate a
PME when VCC=0. Clear the enable bit for the
fan tachometer before removing fan power.
The following requirements apply to all I/O pins
that are specified to be 5 volt tolerant.
I/O
buffers
that
compatible are powered by VCC. Under
VTR power (VCC=0), these pins may only
be configured as inputs. These pins have
input buffers into the wakeup logic that are
powered by VTR.
I/O buffers that may be configured as either
push-pull or open drain under VTR power
(VCC=0), are powered by VTR. This
means they will, at a minimum, source their
specified current from VTR even when VCC
is present.
are
wake-up
event
The GPIOs that are used for PME wakeup
inputs are GP10-GP17, GP20-GP22, GP24-
GP27, GP30-GP37, GP41, GP43, GP50-GP57,
GP60, GP61. These GPIOs function as follows
(with the exception of GP60 and GP61 - see
below):
Buffers are powered by VCC, but in the
absence of VCC they are backdrive
protected (they do not impose a load on any
external VTR powered circuitry). They are
wakeup compatible as inputs under VTR
power. These pins have input buffers into
the wakeup logic that are powered by VTR.
All GPIOs listed above are for PME wakeup as a
GPIO function (or alternate function). Note that
GP33 cannot be used for wakeup under VTR
power (VCC=0) since this is the fan control pin
which comes up as output and low following a
VCC POR and Hard Reset. Also, GP33 reverts
to its non-inverting GPIO output function when
VCC is removed from the part. GP43 reverts to
the basic GPIO function when VCC is removed
form the part, but its programmed input/output,
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