RA8835A
Version 1.0
Dot Matrix LCD Controller
8-6 16 x 16-dot Graphic Display
8-6-1 Command Usage
This example shows how to display 16 x 16-pixel characters. The command sequence is as
follows:
CSRW
Set the cursor address.
CSRDIR Set the cursor auto-increment direction.
MWRITE Write to the display memory.
8-6-2 Kanji Character Display
The program for writing large characters operates as follows:
1. The microprocessor reads the character data from its ROM.
2. The microprocessor sets the display address and writes to the VRAM. The flowchart is
shown in Figure 8-13.
A0 = 0
A0 = 1
O8 O7 O6 O5 O4 O3 O2 O1 O8 O7 O6 O5 O4 O3 O2 O1
0H
(1)
(2)
(3)
(5)
(7)
(9)
(4)
(6)
(8)
1H
2H
3H
4H
(n) shows the CG ROM
data readout order
(10)
5H
6H
7H
8H
9H
AH
BH
CH
DH
EH
FH
(11)
(13)
(15)
(17)
(19)
(21)
(23)
(25)
(27)
(29)
(31)
(12)
(14)
(16)
(18)
(20)
(22)
(24)
(26)
(28)
(30)
(32)
1st column
2nd column
(6)
(4)
(2)
2nd column
memory area
(19)
(17)
(15)
(13)
(11)
(9)
(4)
(2)
1st column
memory area
(7)
(5)
(3)
(1)
(3)
(1)
Data held in the microprocessor memory
Data written into the RA8835 display memory
Figure 8-11: Graphics Address Indexing
RAiO TECHNOLOGY INC.
www.raio.com.tw
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RAIO [ RAIO TECHNOLOGY INC. ]
