Freescale Semiconductor M5211DEMO, Manual

Page: 15 / 18

User Options
Demonstration Board for Freescale MCF5211, Rev. 1
Freescale Semiconductor 15
A SW2_LED pad has been provided but not installed. If installed, this LED will light on SW2 press and
will remain lit for approximately 2 ms after SW2 release.
12.3 Potentiometer
A 5 k
Ω
, thumb-wheel type, potentiometer at RV1 provides continuous, variable resistance input for user
applications. The output is the result of a voltage divider that changes as the thumb-wheel is turned. The
potentiometer is connected between VDD and GND with the center tap providing the divider output. This
center tap is connected to the MCU on signal AN0. The potentiometer may be disconnected from AN0 by
means of the POT_EN option header, shown in
Figure 12 .
Figure 12. POT_EN Option Header
12.4 User Option Connection Summary
Table 4 summarizes user option connections on the development board.
Table 4. User Option Connections
Option MCU Port MCU Pin
SW1 IRQ4 57
SW2 IRQ7 58
LED1 DTIN0 22
LED2 DTIN1 23
LED3 DTIN2 18
LED4 DTIN3 19
RV1 AN0 25
User POT enabled
POT_EN
User POT disabled
ON
POT_EN
OFF