ra8835 Topway Display, ra8835 Datasheet - Page 52

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

RAiO TECHNOLOGY INC.
Version 1.7
SAG
Character code
+ROW select
address
CG RAM address
CG RAM address
7-16-1 M1 = 1
7-16-2 CG RAM Addressing Example
The RA8835 series automatically converts all bits set in bit 6 of character code for CG RAM 2 to
zero. Because of this, the CG RAM data areas become contiguous in display memory.
When writing data to CG RAM:
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.
Note: Lines = 1: lines in the character bitmap
Table-22B: Character Fonts, 9
• Calculate the address as for M1 = 0.
• Change bit 6 of the character code from “1” to “0”.
• 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).
VA15 VA14 VA13 VA12 VA11 VA10 VA9 VA8 VA7 VA6 VA5 VA4 VA3 VA2 VA1 VA0
VA15 VA14 VA13 VA12 VA11 VA10 VA9
A15 A14 A13 A12 A11 A10 A9
0
0
Lines = 2: lines in the character bitmap
0
0
0
0
ROW 14
ROW 15
ROW 7
ROW 8
ROW 0
ROW 1
ROW 2
ROW
Figure 7-28: Row Select Address
0
0
R3
0
0
0
0
1
1
1
D7
0
R2
D6
0
0
0
1
0
1
1
≤
0
52/86
Number of Lines
D5
R1
0
0
0
1
1
0
1
1
VA8
A8
D4
0
R0
0
1
0
1
0
0
1
≤
≤
9
8
VA7
A7
D3
Line 1
0
≤
VA6
A6
D2
Line 2
0
16 (M2 = 1, M1 = 0)
VA5
A5
D1
0
Dot Matrix LCD Controller
VA4
A4
D0
0
VA3
A3
R3
0
www.raio.com.tw
A2
VA2
R2
RA8835
0
A1
VA1
R1
0
A0
VA0
R0
0