ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 55

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

RAiO TECHNOLOGY INC.
Version 1.0
7-16-2 CG RAM Addressing Example
CGRAM AD
MWRITE
CSRDIR
CSRW
P16
As the character code table in Figure 7-29 shows, codes 80H to 9FH and E0H to FFH are
allocated to the CG RAM and can be used as desired. 80H is thus the first code for CG RAM. As
characters cannot be used if only using graphics mode, there is no need to set the CG RAM data.
P1
P2
P1
P2
P2
P3
P4
P5
P6
P7
P8
P8
P
↓
• Define a pattern for the “A” in Figure 7-9.
• The CG RAM table start address is 4800H.
• The character code for the defined pattern is 80H (the first character code in the CG RAM
area).
5CH
4CH
00H
40H
46H
00H
48H
42H
70H
88H
88H
88H
F8H
88H
88H
00H
00H
00H
↓
Reverse the CG RAM address calculation to calculate SAG
Set cursor shift direction to right
CG RAM start address is 4800H
Write ROW 0 data
Write ROW 1 data
Write ROW 2 data
Write ROW 3 data
Write ROW 4 data
Write ROW 5 data
Write ROW 6 data
Write ROW 7 data
Write ROW 8 data
↓
Write ROW 15 data
Table-23: Character Data Example
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Dot Matrix LCD Controller
RA8835A
www.raio.com.tw