ra8835 Topway Display, ra8835 Datasheet - Page 61

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

RAiO TECHNOLOGY INC.
Version 1.7
◎ Display Memory Allocation
◎ Register Setup Procedure
SYSTEM SET
C = 40H
P1 = 30H
P2 = 87H
P3 = 07H
P4 = 27H
P5 = 2FH
P6 = C7H
P7 = 28H
P8 = 00H
SCROLL
C =
P1 = 00H
P2 = 00H
P3 = C8H
P4 = E8H
P5 = 03H
P6 = C8H
P7 = XH
P8 = XH
P9 = XH
P10 = XH
CSR FORM
C = 5DH
P1 = 04H
P2 = 86H
HDOT SCR
C = 5AH
P1 = 00H
OVLAY
44H
First layer (text): 320/8 = 40 characters per line, 200/8 = 25 lines. Required memory
size = 40 x 25 = 1000 bytes.
Second layer (graphics): 320/8 = 40 characters per line, 200/1 = 200 lines. Required
memory size = 40 x 200 = 8000 bytes.
f
f
(1/6) x 9 x [TC/R] x 200 = 1/70
OSC
FR
Figure 8-2: Character Over Graphics Layers
TC/R calculation
[TC/R] = 48, so TC/R = 2FH
= 70 Hz
= 6 MHz
(1000 bytes)
1st character layer
0000H
(8000 bytes)
03E8H
2nd graphics layer
61/86
03E7H
2327H
Dot Matrix LCD Controller
www.raio.com.tw
RA8835