RA8835A
Version 1.0
Dot Matrix LCD Controller
Table-25: Initialization Procedure
Command Operation
No.
1
2
3
Power-up
Supply
SYSTEM SET
C = 40H
P1 = 30H
M0: Internal CG ROM
M1: CG RAM is 32 characters maximum
M2: 8 lines per character
W/S: Two-panel drive
IV: No top-line compensation
FX: Horizontal character size = 8 pixels
WF: Two-frame AC drive
P2 = 87H
P3 = 07H
P4 = 27H
P5 = 2FH
FY: Vertical character size = 8 pixels
C/R: 39 display addresses per line
TC/R: Total address range per line = 47
fOSC = 8.0 MHz, fFR = 70 Hz
L/F: 239 display lines
AP: Virtual screen horizontal size is 40
addresses
P6 = EFH
P7 = 28H
P8 = 00H
SCROLL
C = 44H
4
P1 = 00H
P2 = 00H
P3 = F0H
P4 = 80H
P5 = 25H
P6 = F0H
P7 = 00H
P8 = 4BH
First screen block start address
Set to 0000H
Display lines in first screen block = 240
Second screen block start address
Set to 1000H
Display lines in second screen block = 240
Third screen block start address
Set to 4B00H
P9 = 00H
P10 = 00H
Fourth screen block start address
Set to 0000H
Display memory
1st display memory page
2nd display memory page
(SAD1) 0000H
(SAD2) 2580H
3rd display memory page
4th display memory page
(SAD3) 4B00H
(SAD4) 0000H
5
HDOT SCR
C = 5AH
P1 = 00H
Set horizontal pixel shift to zero
(continued)
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