ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 69

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
8-3 System Interconnection
converter
POFF
Supply
Power
processor
Micro -
V
REG
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
Graphics data table
RESET
IORQ
D0
D7
WR
RD
A0
to
A1
To
A7
RESET
Decoder
Contains character codes for text display
Each character requires 8 bits
Table mapping can be changed by using the scroll start function
Contains graphics bitmaps
Word length is 8 bits
Table mapping can be changed
V1
V2
V3
V4
V5
Figure 8-6: System Interconnection Diagram
RESET
CS
XD0
XD3
A0
RD
WR
To
RA8835
10MHz crystal
XG
VA13
VA15
VRD
VCE
VA 12
VD0
VD7
XD
VA0
To
To
To
LAT
INH
YSCL
FR
DI
A0 to A 12
HC138
D0 to D 7
A
B
C
69/88
(RAM 1)
Y7
Y6
Y0
to
CS 7
CS 6
CS 0
WE
CS 1
CS 2
OE
to
LCD UNIT
EI
FR
A0 to A 12
D0 to D 7
(RAM 2)
E0
WE
CS 1
CS 2
OE
EI
FR
A0 to A 11
(CGROM )
D0 to D 7
LCD
Dot Matrix LCD Controller
E0
CE
OE
RA8835A
www.raio.com.tw
EI
FR
E0