Altera Embedded Peripherals IP - Manual (Page 119)

Optrex 16207 LCD Controller Core
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Core Overview
The Optrex 16207 LCD controller core with Avalon ® Interface (LCD controller core) provides the
hardware interface and software driver required for a Nios ® II processor to display characters on an
Optrex 16207 (or equivalent) 16×2-character LCD panel. Device drivers are provided in the HAL system
library for the Nios II processor. Nios II programs access the LCD controller as a character mode device
using ANSI C standard library routines, such as
printf()
. The LCD controller is Qsys-ready, and
integrates easily into any Qsys-generated system.
The Nios II Embedded Design Suite (EDS) includes an Optrex LCD module and provide several ready-
made example designs that display text on the Optrex 16207 via the LCD controller.
For details about the Optrex 16207 LCD module, see the manufacturer's Dot Matrix Character LCD
Module User's Manual available at www.optrex.com .
Functional Description
The LCD controller core consists of two user-visible components:
• Eleven signals that connect to pins on the Optrex 16207 LCD panel—These signals are defined in the
Optrex 16207 data sheet.
•
E
—Enable (output)
•
RS
—Register Select (output)
•
R/W
—Read or Write (output)
•
DB0
through
DB7
—Data Bus (bidirectional)
• An Avalon Memory-Mapped (Avalon-MM) slave interface that provides access to 4 registers.
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