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3.2 LCD Display / Controller
The TWR-LCD features a Truly Semiconductor 3.2” TFT LCD with an analog resistive touch overlay.
3.2.1 Communication Mode
The LCD utilizes a 240 RGB x 320 QVGA display controller. The display controller is accessible to the
on-board MCF51JM MCU through SPI. The controller is also accessible to any compatible Tower MCU
module through SPI or the External Bus Interface (EBI) via the primary Tower Side Expansion Ports.
Use SW1-DIP1 and DIP2 to configure the desired interface mode (SPI or EBI). Refer to Section 4 for
more configuration details.
Table 1 - LCD Communication Mode Settings
SW1-DIP1
(PS2)
OFF
ON
ON
SW1-DIP 2
(PS0)
ON
OFF
ON
Description
Enables SPI communication mode to the LCD Display; can be
driven by SPI0 on the Primary Elevator or by the on-board
MCF51JM, selectable by JM/ELE (SW1-DIP3)
Enables EBI (16b mode) communication to the LCD Display
This interface is only accessible from the Tower Elevator MCU
Enables EBI (8b mode) communication to the LCD Display
This interface is only accessible from the Tower Elevator MCU
3.2.2 MCU Selection
The LCD can be controlled by either the on-board MCF51JM MCU or a compatible Tower MCU
Module.
Use SW1-DIP3 to specify which MCU has access to the display controller. Refer to Section 4 for more
configuration details.
Table 2 - Display Driver MCU Selection
JM/ELE
(SW1-DIP3)
ON
OFF
Enables SPI connection from SPI0 of Primary Elevator Connector
Enables SPI connection from on-board MCF51JM MCU
Setting the JM/ELE (SW1-DIP3) configuration switch to the “Off” position will isolate the SPI signals
from the Tower MCU allowing a direct connection between the on-board MCF51JM MCU and the LCD
display controller.
Setting the JM/ELE configuration switch to the “On” position will cause both the on -board MCF51JM
MCU and Tower MCU SPI signals to be simultaneously connected to the LCD display controller. It is
required that on-board MCF51JM MCU firmware detect the status of the JM/ELE signal and tri-state
the on-board MCF51JM MCU SPI signals.
TWR-LCD User’s Manual
Page 5 of 13
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相关代理商/技术参数
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