44
DEMOQE128 User Manual
8.8
Analog Input Potentiometer
The DEMOQE128 provides an easy access 10Kohm potentiometer whose
output may be connected to PTC6 and/or PTA0, selectable by J21, POT_EN.
8.8.1
J21 - Potentiometer Output Selection Jumpers POT_EN
Selects the potentiometer output connection. By default it is
connected to PTA0.
Figure 8-17: Potentiometer Output Selection Jumpers POT_EN (J21)
8.9
Optional External Crystal Circuitry Jumper Enable
The DEMOQE128 provides external crystal circuitry without components
populated. A user may use jumper J17, CLOCK_EN, to enable the external
crystal circuitry.
8.9.1
J17 - External Crystal Circuitry Enable Jumpers CLOCK_EN
Enables or disables the external crystal circuitry. Both positions must
be installed to enable use of crystal circuitry.
Figure 8-18: External Crystal Circuitry Enable Jumper CLOCK_EN (J17)
8.10
Optional Jumpers For Various VDD And VSS
The DEMOQE128 provides 5 jumpers, J22 through J26, for different VDD and
VSS connections on the bottom of the board. By default, they are not
populated and are shorted correspondingly with zero-ohm resistors in parallel,
except J24 which is populated. A user may take off the zero-ohm resistor and
install a corresponding jumper.
9
DEMOQE128 CODE DEVELOPMENT SOFTWARE
The DEMOQE128 includes P&E’s Embedded Multilink circuitry, so no
