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If utilizing a Tower MCU module to drive the SPI to the LCD display controller, use SW1-DIP5 to specify
the desired SPI chip select.
Table 3 - Tower MCU SPI CS Selection
SPI CS SEL
(SW1-DIP5)
ON
OFF
Select SPI0 CS1 as the chip-select for LCD SPI interface
Select SPI0 CS0 as the chip-select for LCD SPI interface
3.2.3 Resistive Touch Overlay
The TWR-LCD display features an integrated analog resistive touch panel. The panel can be access by
either the on-board MCF51JM MCU or a compatible Tower MCU module. The selection of which MCU
interfaces the Touch Panel is independent of which MCU is driving the LCD display controller
(designated by JM/ELE).
Use SW1-DIP6 to specify which MCU has access to the resistive touch panel. Refer to Section 4 for
more configuration details.
Table 4 - Resistive Touch MCU Selection
TP SEL
(SW1-DIP6)
ON
OFF
Disables MCF51JM connection to the LCD Touch Panel
Use SW5 to enable ADC connection from Primary Elevator Connector
Enables MCF51JM connection to the LCD Touch Panel
Ensure that all switches on SW5 DIP are OFF
Setting the TP SEL (SW1- DIP6) configuration switch to the “Off” position will indicate to the on -board
MCF51JM MCU that it is the interfacing MCU to the touch panel’s analog signals.
Setting the TP SEL configuration switch to the “On” position will indicate to the on-board MCF51JM
MCU that the tower MCU Module is the interfacing MCU to the touch panel’s analog signals. It is
required that on-board MCF51JM MCU firmware detect the status of the To SEL signal and tri-state
the respective on-board MCF51JM MCU ADC signals.
SW5 is used to isolate the touch panel’s analog signals from the Tower Elevator Side Expansion Port.
This ensures correct isolation of the analog signals when the on-board MCF51JM MCU is used. SW5-
DIP[4:1] should all be set to the “Off” position if the on -board MCF51JM MCU is being used to
interface the resistive touch panel.
TWR-LCD User’s Manual
Page 6 of 13
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