NXP Semiconductors TWR-S12G128-KIT, User Manual, Page: 15 / 19

T W R - 9 S 1 2 G 1 2 8 J U N E 2 , 2 0 1 0
U S E R G U I D E
15
User LED’s
The TWR-S12G128 target board applies 4, green, LEDs for output indication. Each LED is
configured for active-low operation. A series, current-limit resistor prevents excessive diode
current. Each LED is connected to a timer channel on the target MCU. Figure 12 below
shows the USER jumper settings.
Pushbutton Switches
The TWR-S12G128 provides 4 push-button switches for user input. Each push-button switch
is configured for active-low operation and is connected to a key-wakeup input on the target
MCU. No bias is applied to these push-button inputs and use of target MCU internal pull-ups is
required for proper operation. Figure 12 below shows the USER jumper settings.
Figure 12: JP1 Option Header
JP1 Signal ON OFF
SW1
 
PAD4/KWAD4/AN4 Enabled Disabled
SW2
 
PAD5/KWAD5/AN5 Enabled Disabled
SW3
 
PAD6/KWAD6/AN6 Enabled Disabled
SW4
 
PAD7/KWAD7/AN7 Enabled Disabled
POT
 
PAD0/KWAD0/AN0 Enabled Disabled
LED1
 
PT4/IOC4 Enabled Disabled
LED2
 
PT5/IOC5 Enabled Disabled
LED3
 
PT6/IOC6 Enabled Disabled
LED4
 
PT7/IOC7 Enabled Disabled
NOTE: User peripheral input/output is enabled by default.
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