RA8835A
Version 1.0
Dot Matrix LCD Controller
8-3 System Interconnection
10MHz crystal
XD
VA13
To
VA15
XG
A0
CS
HC138
Y7
A0
CS7
A
CS6
Y6
to
A1
To
A7
B
C
to
Y0
CS0
VCE
Micro -
processor
Decoder
VRD
VA0
To
IORQ
RA8835
VA12
D0
to
A0 to A12
A0 to A12
A0 to A11
WE
WE
OE
CE
(RAM1) CS1
CS2
(RAM2) CS1
CS2
D7
(CGROM )
D0 to D7
RD
RD
D0 to D7
D0 to D7
OE
OE
WR
WR
RESET
RESET
XD0
To
VD0
To
VD7
RESET
XD3
LAT
DI
LCD
INH
FR
YSCL
POFF
V1
V2
V3
V4
V5
FR
EI
FR
EI
FR
EI
Power
Supply
converter
E0
E0
E0
V
REG
LCD UNIT
Figure 8-6: System Interconnection Diagram
The RA8835A series layered screens and flexible scrolling facilities support a range of display
functions and reduces the load on the controlling microprocessor when displaying underlining,
inverse display, text overlaid on graphics or simple animation.
These facilities are supported by the RA8835A series ability to divide display memory into up to
four different areas.
◎ Character code table
Contains character codes for text display
Each character requires 8 bits
Table mapping can be changed by using the scroll start function
◎ Graphics data table
Contains graphics bitmaps
Word length is 8 bits
Table mapping can be changed
RAiO TECHNOLOGY INC.
www.raio.com.tw
69/88
RAIO [ RAIO TECHNOLOGY INC. ]
