ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 34

• Manufacturer Part Number: ra8803
• Description: Two Layers Character/graphic Lcd Controller Specification
• Manufacturer: RAIO Technology Inc.

Version 2.5
7. Display Functions
RAiO
7-1 Text Mode
TECHNOLOGY INC.
The text mode of RA8803/8822 supports full size(Chinese) and half size display. The full size character
consists of 16x16 dots matrix and half size is 8x16 dots. The Figure 7-1 is an example to show the Full
size and half size character.
In the past, if user wants to show the Chinese character has to in the graphics mode and use bit map
data to fill the Chinese font one byte by one byte. But the RA8803/8822 embedded hardware Chinese
engine could accept two bytes Chinese BIG5 or GB code from MPU and show the character in text
mode directly. Before the MPU pass 2bytes Chinese code to RA8803/8822, the user need to assign the
cursor to the right position like traditional text mode. Because each Chinese code is 2byte, so if the MPU
interface is use 8-bit then the MPU has to send twice(High byte and Low byte). If want to show English
or numeric then MPU only need to send one byte ASCII code.
The RA8803 supports maximum 320x240 pixel resolution of display. Therefore the maximum full size
character number at one page is 20x15, and half size character is 40x15. The RA8822 supports
maximum 240x160 pixel display. Therefore the maximum full size character number at one page is
15x10, and half size character is 30x10.
Figure 7-2: Mixed Display Mode of Full and Half Size Font
Figure 7-1: Full and Half Size Font
Chinese 16x16
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Two Layers Character/Graphical LCD Controller
English 8x16
RA8803/8822
www.raio.com.tw