User Led's; Pushbutton Switches; Figure 12: Jp1 Option Header - Axiom NXP TWR-S12G128-KIT User Manual

T W R - 9 S 1 2 G 1 2 8
U S E R G U I D E

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

SW1

SW2

SW3

SW4

POT

LED1

LED2

LED3

LED4
NOTE: User peripheral input/output is enabled by default.
Signal

PAD4/KWAD4/AN4

PAD5/KWAD5/AN5

PAD6/KWAD6/AN6

PAD7/KWAD7/AN7

PAD0/KWAD0/AN0

PT4/IOC4

PT5/IOC5

PT6/IOC6

PT7/IOC7
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
15
J U N E 2 , 2 0 1 0
ON OFF
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled