RA8835A
Version 1.0
Dot Matrix LCD Controller
1. Overview
The RA8835A is a controller IC that can display text and graphics on LCD panel. It can display layered text
and graphics, scroll the display in any direction and partition the display into multiple screens. It also stores
text, character codes and bitmapped graphics data in external frame buffer memory. Display controller
functions include transferring data from the controlling microprocessor to the buffer memory, reading
memory data, converting data to display pixels and generating timing signals for the buffer memory, LCD
panel.
The RA8835A has an internal character generator with 160, 5x7 pixel characters in internal mask ROM. The
character generators support up to 64, 8x16 pixel characters in external character generator RAM and up to
256, 8x16 pixel characters in external character generator ROM.
2. Features
Text, graphics and combined text/graphics
display modes
Three overlapping screens in graphics
mode
Up to 640x256 pixel LCD panel display
resolution
Programmable cursor control
Smooth horizontal and vertical scrolling of
all or part of the display
Up to 64, 8x16 pixel characters in external
character generator RAM
Up to 256, 8x16 pixel characters in external
character generator ROM
6800 and 8080 family microprocessor
interfaces
Low power consumption: 3.5mA operating
current (VDD = 3.5V), 0.05µA standby
current
1/2-duty to 1/256-duty LCD drive
Up to 640x256 pixel LCD panel display
resolution memory
160, 5x7 pixel characters in internal mask-
programmed character generator ROM
Package(ROHS Compliance):
RA8835AP3N: QFP-60 pin
RA8835AP4N: TQFP-60 pin
Power: 2.7 to 5.5 V
3. Block Diagram
V A [ 1 5 : 0 ] , V D [ 7 : 0 ] ,
V C E , V R D , V W
R
T E S T
D i s p l a y R A M
I / F
S y s t e m
C o n f i g u r e
2 5 6 B y t e
C G R O M
D a t a
L a t c h
R e g i s t e r s
B l o c k
C u r s o r
C o n t r o l l e r
M C U
I / F
X ’ t a l
O S C
T i m i n g
G e n e r a t o r
D [ 7 : 0 ] , C S , R D ,
W
R
X D
X G
Y D I S , L P ,
W F , X S C L ,
A 0 , R E S , S E L 1 , S E L 2
Y D , Y S C L , X D [ 3 : 0 ]
Figure 3-1: Block Diagram
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RAiO TECHNOLOGY INC.
www.raio.com.tw
RAIO [ RAIO TECHNOLOGY INC. ]
