AN1924 Motorola / Freescale Semiconductor, AN1924 Datasheet - Page 5

• Manufacturer Part Number: AN1924
• Description: AN1924 Interfacing Serial LCDs to a DSP56F805s SCI and Porting Code Using the Embedded SDK
• Manufacturer: Motorola / Freescale Semiconductor

4.
4.1 Connecting the 634 LCD to the DSP56F805
4.2
Among the features of the LCD+ :
Although the LCD+ may offer more than needed for this effort, other applications may require some of
its features. The LCD+ has its own microcontroller and software in ROM to implement its features. An
example of its display is shown in
See
This section explains how to connect each LCD to the DSP56F805 device and contains code examples
demonstrating the interface.
The Crystalfontz 634 Intelligent Serial LCD module comes equipped with a male DB9 connector port.
The lines on the female side are connected in null modem fashion to the three pins of the EVM board’s
J17 header; i.e., EVM_TXD is connected to LCD_RXD.
Metrowerks’ CodeWarrior, an Embedded DSP C compiler for the DSP568xx, was used to write,
compile and execute the code to control the 634 LCD.
between DSP56F805 and the 634 LCD device.
Software for the 634 LCD and the DSP56F805
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Appendix A.
Interfacing the LCDs to the DSP56F805
Serial I/O: RS-232 or Inverted TTL (2400 to 57600 Baud (8,N,1))
Keypad input: 4x4 matrix type
Power requirements: 5V to 15V DC at 9mA (200mA maximum with the backlight on)
LCD type: 4x20 Supertwist
Analog-to-Digital Converters: a bank of 10 with 10-bit resolution
Relay Drivers
FlashROM
for additional details about the LCD+.
Figure 4. Example of NetMedia’s LCD+ display
Interfacing LCDs and Porting Code
Figure
4.
Code Example 1
Interfacing the LCDs to the DSP56F805
demonstrates the interface
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