TWR-LCD Freescale Semiconductor, TWR-LCD Datasheet - Page 8

• Manufacturer Part Number: TWR-LCD
• Description: LCD MODULE FOR TWR SYSTEM
• Manufacturer: Freescale Semiconductor

Specifications of TWR-LCD

• Accessory Type: LCD Display
• Product: Microcontroller Modules
• Data Bus Width: 32 bit
• Core Processor: MCF51JM
• Interface Type: USB, I2C, SPI
• Operating Supply Voltage: 5 V
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V1
• Silicon Core Number: MCF51
• Silicon Family Name: Flexis - MCF51AC, MCF521x, MCF5301x
• Rohs Compliant: Yes
• For Use With/related Products: Freescale Tower System
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(KBEDG7=0) for KBI functionality. Refer to the MCF51JM128 Reference Manual, Section 9, for
additional details. The SD Card Detect signal must be configured as an internal pull‐up regardless of
which host MCU is accessing the MicroSD Card slot.
3.4 5­way Navigation Switch
The TWR‐LCD features a 5‐way Navigation Switch. This switch will allow user interaction with the TWR‐
LCD providing a method to indicate Up (North), Down (South), Right (East), Left (West), and Select
(Center). The corresponding directional signals are connected to the on‐board MCF51JM MCU. It is
intended that the on‐board MCF51JM MCU firmware either respond directly to the Navigation Switch
or relay the signal detection to the Tower MCU module through the I2C interface.
It is possible to connect the 5‐way Navigation Switch directly to the Tower Elevator by making a
hardware modification to the TWR‐LCD.
The following resister will should to be populated to create a direct connection to the Tower Elevator:
R19, R22, R23, R24, R26, R28, R29, R32, R41, R44
The resisters are intentionally unpopulated in the final design to ensure maximum compatibility with
additional Freescale Tower MCU and Peripheral Modules.
Populating these resisters will enable to following connections:
Refer to the “Optional Nav Switch Connections to Elevator” section within the TWR‐LCD schematics for
additional details.
3.5 Mini­B USB Connection
The TWR‐LCD features a Mini‐B USB connection on the lower right corner of the module. The USB
connector is used to provide power to the TWR‐LCD module when operating in stand‐alone mode (not
connected to the tower system). The USB data signals are connected to the on‐board MCF51JM MCU
allow a connection to exist between a host device and the TWR‐LCD.
In Boot Loader mode, if the USB cable is connected to a host PC, the TWR‐LCD will enumerate as a
Mass Storage Device. If an appropriate compiled binary (.s19) file is placed in the root directory of the
enumerated storage drive, the TWR‐LCD will parse the binary file and reprogram the main application
running on the TWR‐LCD. Refer to Section 3.6 for more details.
Navigation Direction
Select (Center)
Down (South)
Right (East)
Left (West)
Up (North)
TWR‐LCD User’s Manual
Tower Elevator Connection
GPIO7 (Pin A11)
GPIO8 (Pin A10)
GPIO5 (Pin B52)
GPIO1 (Pin B21)
GPIO9 (Pin A9)
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