XE8000EV108 Semtech, XE8000EV108 Datasheet - Page 79

• Manufacturer Part Number: XE8000EV108
• Description: EVAL BOARD FOR XE8806/XE8807
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV108

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC06AMI026
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

13.4 Port D (PD) Operation
The direction of each pin of Port D (input or input/output) can be individually set by using the RegPDDir register. If
PDDir[x] = 1, the output buffer on the corresponding Port D pin is enabled. After reset, Port D is in input only mode
(PDDir[x] are reset to 0). The input buffer is always enabled independently from the RegPDDir contents.
Output data:
Data are stored in RegPDOut prior to output at Port D.
Input data:
The status of Port D is available in RegPDIn (read only). Reading is always direct - there is no digital debounce
function associated with Port D. In case of possible noise on input signals, a software debouncer or an external
filter must be realised.
Pull-up/Snap to Rail:
When configured as an input (PDDir[x]=0), pull-ups are available on every pin. The pull-up function of the pins is
controlled two by two by the PDPullup and PDSnapToRail bits in the register RegPDPullup. When a bit
© Semtech 2006
Pos.
Pos.
Pos.
Pos.
7:0
7:0
7:0
7
6
5
4
3
2
1
0
RegPDIn
RegPDOut
RegPDDir
RegPDPullup
PDSnapToRail[3]
PDSnapToRail[2]
PDSnapToRail[1]
PDSnapToRail[0]
PDPullup[3]
PDPullup[2]
PDPullup[1]
PDPullup[0]
PDOut[7:0]
PDDir[7:0]
PDIn[7:0]
Table 13-5: RegPDPullup
Table 13-3: RegPDOut
Table 13-4: RegPDDir
Rw
r
Rw
r w
Rw
r w
Rw
r w
r w
r w
r w
r w
r w
r w
r w
Table 13-2: RegPDIn
Reset
Reset
0 nresetpconf
Reset
Reset
1 nresetpconf
1 nresetpconf
1 nresetpconf
1 nresetpconf
1 nresetpconf
1 nresetpconf
1 nresetpconf
1 nresetpconf
0 nresetpconf
13-3
-
Description
Description
Description
Description
pad PD[7:0] input value
snap-to-rail for pad PD[7]
snap-to-rail for pad PD[5]
snap-to-rail for pad PD[3]
snap-to-rail for pad PD[1]
pad PD[7:0] output value
pullup for pad PD[7] and
pullup for pad PD[5] and
pullup for pad PD[3] and
pullup for pad PD[1] and
pad PD[7:0] direction
and PD[6] (1=active)
and PD[4] (1=active)
and PD[2] (1=active)
and PD[0] (1=active)
PD[6] (1=active)
PD[4] (1=active)
PD[2] (1=active)
PD[0] (1=active)
(0=input)
XE8806A/XE8807A
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