參數(shù)資料
型號(hào)： XE8000EV108
廠商： Semtech
文件頁數(shù)： 123/143頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XE8806/XE8807
標(biāo)準(zhǔn)包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC06AMI026
所含物品： 完全組裝的評(píng)估板
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
13-4
XE8806A/XE8807A
PDPullup[x] is 0, the pull-ups on the pins PD[2x] and PD[2x+1] are disabled. When a bit PDPullup[x] is set to 1
and the bit PDSnapToRail[x] is set to 0, the pull-up resistor is connected to the pins PD[2x] and PD[2x+1]. When
both PDPullup[x] and PDSnapToRail[x] are 1, the snap-to-rail function is active on the pins PD[2x] and PD[2x+1].
The snap-to-rail function connects a pullup or pulldown resistor to the input pin depending on the value forced on
the input pin. This function can be used for instance when the input port is connected to a tristate bus. When the
bus is floating, the pullup or pulldown maintains the bus in the last low impedance state before it became floating
until another low impedance output is driving the bus. It also reduces the power consumption with respect to a
classic pullup since it selects the pullup or pulldown resistor so that it confirms the detected input state.
The function is summarised in the table below as a function of the different register settings.
PDDir[2x(+1)]
PDPullup[x]
PDSnapToRail[x]
(last) externally
forced
PD[2x(+1)] value
PD[2x(+1)] pull
resistor
1
x
not connected
0
x
not connected
0
1
0
x
pullup
0
1
0
pulldown
0
1
pullup
Table 13-6: Snap-to-rail and pullup function
At power-on reset, Port D is configured as an input port with all pull-ups active.
13.5
Port D electrical specification
sym
description
min
typ
max
unit
Comments
VINH
Input high voltage
0.7*VBAT
VBAT
V
VBAT
≥2.4V
VINL
Input low voltage
VSS
0.2*VBAT
V
VBAT
≥2.4V
VOH
Output high voltage
VBAT-0.4
VBAT
V
VBAT=1.2V, IOH =0.3mA
VBAT=2.4V, IOH =5.0mA
VBAT=4.5V, IOH =8.0mA
VOL
Output low voltage
VSS
VSS+0.4
V
VBAT=1.2V, IOL =0.3mA
VBAT=2.4V, IOL
=12.0mA
VBAT=4.5V, IOL
=15.0mA
RPU
Pull-up resistance
20
50
80
k
Cin
Input capacitance
3.0
pF
Note 1
Note 1: this value is indicative only since it depends on the package.
Table 13-7. Port D electrical specification
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