ra8835 Topway Display, ra8835 Datasheet - Page 51

• Manufacturer Part Number: ra8835
• Description: Dot Matrix Lcd Controller
• Manufacturer: Topway Display

RAiO TECHNOLOGY INC.
Version 1.7
Internal/external character generator
selection
Character field
height
Internal CG ROM/RAM select
External CG ROM/RAM select
CG RAM bit 6 correction
CG RAM data storage address
Character code
External CG
7-16 Setting Character Generator Address
+ROW select
Address
ROM
address
SAG
Note that there can be no more than 64 characters per bank.
The CG RAM addresses in the VRAM address space are not mapped directly from the address in the
SAG register. The data to be displayed is at a CG RAM address calculated from SAG + character
code + ROW select address. This mapping is shown in Table-22A and –22B.
8x16 pixels max)
Basic CG space
(256 characters,
Item
More than 192
characters
1 to 8 pixels
9 to 16 pixels
Greater than 16 pixels
192 characters or less
Table-22A: Character Fonts, Number of Lines
A15 A14 A13 A12 A11 A10 A9
0
0
Figure 7-27: Internal and External Character Mapping
0
0
M0=1
M0=1
0
0
0
0
Table-21: Character Mapping
Built-in CG ROM
Built-in CG ROM
(160 characters,
(160 characters,
5x7 pixels max)
5x7 pixels max)
CG RAM
CG RAM
0
0
CG ROM
M0
M2 = 0
M2 = 1
Graphics mode (8 bits ´1 line)
Automatic
M1
Specified with CG RAM ADR
command
Other than the area of Figure
7-2A
Set SAG to F000H and overly
SAG and the CG ROM table
CG RAM
D7
0
(64 characters max, 8x16 pixeis max )
51/86
(64 characters max, 8x16 pixeis max )
D6
Parameter
0
A8
D5
SAG
0
CG RAM
ADR
A7
D4
0
≤
256 characters max
M1=0
256 characters max
M1=1
8 (M2 = 0, M1 = 0)
A6
D3
0
CG RAM 1
CG RAM 1
A5
D2
0
CG RAM 2
CG RAM 2
Determined by the character
code
Can be moved anywhere in
the display memory address
space
CG RAM n
CG RAM n
Dot Matrix LCD Controller
A4
D1
0
A3
D0
0
Remarks
www.raio.com.tw
A2
RA8835
R2
0
A1
R1
0
A0
R0
0