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D E M O 9 S 1 2 X H Y 2 5 6
J U L Y
1 5 ,
2 0 1 0
U S E R G U I D E
USER I/O
User I/O includes 1 potentiometer, 4 push button switches, and 4 green LEDs for user I/O.
The USER (JP14) option header enables or disables each User I/O function individually. The
sections below provide details on user I/O. Figure 19 below shows the USER jumper settings.
Potentiometer
The DEMO9S12XHY256 target board provides a single-turn, 5K, ohm potentiometer (POT) to
simulate analog input. The POT is connected to an ATD input. The POT is decoupled to
minimize noise transients during adjustment.
settings.
LED’s
The DEMO9S12XHY256 target board provides 4, green, LEDs for output indication. Each
LED is configured for active-low operation. A series, current-limit resistor prevents excessive
diode current. Figure 19 below shows the USER jumper settings.
Pushbutton Switches
The DEMO9S12XHY256 provides 4 push-button switches for user input. Each push-button
switch is configured for active-low operation. No bias is applied to these push-button inputs.
Use of target MCU internal pull-ups is required for proper operation. Figure 19 below shows
the USER jumper settings.
Figure 19: User Option Header
JP14
ON
USER
Signal
(default)
OFF
LED1
LED2
LED3
LED4
SW1
SW2
SW3
SW4
POT
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
PR0/IOC0_6/KWR0
PR1/IOC0_7/KWR1
PR2/IOC1_6/KWR2
PR3/IOC1_7/KWR3
PAD04/AN04/KWAD4
PAD05/AN05/KWAD5
PAD06/AN06/KWAD6
PAD07/AN07/KWAD7
PAD00/AN00/KWAD0
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
20
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