Xilinx MIcroBlaze Development Spartan-3E 1600E Kit User Manual page 47

R
binary and the lower nibble equates to DB[3:0] = "0011" binary. As shown in
character 'S' appears on the screen.
English/Roman characters are stored in CG ROM at their equivalent ASCII code address.
The character ROM contains the ASCII English character set and Japanese kana characters.
The controller also provides for eight custom character bitmaps, stored in
eight custom characters are displayed by storing character codes 0x00 through 0x07 in a
DD RAM
CG RAM
The Character Generator RAM (CG RAM) provides space to create eight custom character
bitmaps. Each custom character location consists of a 5-dot by 8-line bitmap, as shown in
Figure
The
writing to CG RAM. Write CG RAM data using the
command, and read CG RAM using the
MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide
UG257 (v1.1) December 5, 2007
DB7
DB6
DB5
DB4
Figure 5-4: LCD Character Set
location.
5-5.
Set CG RAM Address command initializes the address counter before reading or
Upper Data Nibble
UG257_05_04_061206
Write Data to CG RAM or DD RAM
Read Data from CG RAM or DD RAM
LCD Controller
Figure 5-4, the
CG RAM. These
command.
45
www.xilinx.com