RA8835
Preliminary Version 1.2
Dot Matrix LCD Controller
1. Overview
The RA8835 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 RA8835 has an internal character generator with 160, 5 X
7 pixel characters in internal mask ROM. The
character generators support up to 64, 8 X
16 pixel characters in external character generator RAM and up to
256, 8 X
16 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 640 X
256 pixel LCD panel display
resolution
Programmable cursor control
Smooth horizontal and vertical scrolling of all or
part of the display
1/2-duty to 1/256-duty LCD drive
Up to 640 X
256 pixel LCD panel display
resolution memory
160, 5 X
7 pixel characters in internal mask-
programmed character generator ROM
Up to 64, 8 X 16 pixel characters in external
character generator RAM
Up to 256, 8 X 16 pixel characters in external
character generator ROM
6800 and 8080 family microprocessor interfaces
Low power consumption—3.5 mA operating
current (V
DD
= 3.5V), 0.05
μA
standby current
Package:
RA8835P3N: QFP-60 pin (Lead Free)
RA8835P4N: TQFP-60 pin (Lead Free)
Power: 2.7 to 5.5 V
3. Block Diagram
V A [1 5 :0 ], V D [7 :0 ],
VCE, VRD, VW R
TEST
2 5 6 B yte
CGROM
D is p la y R A M
I/F
S ys te m
C o n f ig u r e
R e g is t e r s
B lo c k
C u rs o r
C o n t r o lle r
D a ta
L a tc h
MCU
I/F
X ’t a l
OSC
T im in g
G e n e ra to r
D [7 :0 ], C S , R D , W R
A0, R ES, SEL1, SEL2
XD
XG
Y D IS , L P , W F , X S C L ,
Y D , Y S C L , X D [3 :0 ]
RAiO TECHNOLOGY INC.
2/6
www.raio.com.tw
RAIO [ RAIO TECHNOLOGY INC. ]
