RA8835A
Version 1.0
Dot Matrix LCD Controller
6-2 System Control Commands
6-2-1 SYSTEM SET
Initializes the device, sets the window sizes, and selects the LCD interface format. Since this
command sets the basic operating parameters of the RA8835A series, an incorrect SYSTEM SET
command may cause other commands to operate incorrectly.
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
A0 WR RD
C
0
1
0
0
0
0
IV
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
P1
P2
P3
P4
P5
P6
P7
P8
0
W/S M2 M1 M0
WF
0
0
FX
0
FY
C/R
TC/R
L/F
APL
APH
Figure 6-1: SYSTEM SET Instruction
6-2-1-1 C
This control byte performs the following:
1. Resets the internal timing generator
2. Disables the display
3. Cancels sleep mode
Parameters following P1 are not needed if only canceling sleep mode.
6-2-1-2 M0
Select the internal or external character generator ROM. The internal character generator ROM
contains 160, 5 X 7 pixel characters, as shown in Figure 8-14. These characters are fixed at
fabrication by the metallization mask.
The external character generator ROM, on the other hand, can contain up to 256 user-defined
characters.
M0 = 0: Internal CG ROM
M0 = 1: External CG ROM
Note that if the CG ROM address space overlaps the display memory address space, that portion
RAiO TECHNOLOGY INC.
www.raio.com.tw
12/88
RAIO [ RAIO TECHNOLOGY INC. ]
