RA8835A Datasheet, PDF (65/88 Pages) RAIO Technology Inc. – DOT MATRIX LCD CONTROLLER SPECIFICATION

Version 1.0
RA8835A
Dot Matrix LCD Controller
P1 = 04H
P2 = 86H
HDOT SCR
C = 5AH
P1 = 00H
OVLAY
C = 5BH
P1 = 00H
DISP ON/OFF
C = 59H
P1 = 16H
X = Don’t care
8-1-4 Display Mode Setting Example 2: combining graphics and graphics
◎ Conditions
„ 320x200 pixels, single-panel drive (1/ 200 duty cycle)
„ First layer: graphics display
„ Second layer: graphics display
◎ Display Memory Allocation
„ First layer (graphics): 320/8 = 40 characters per line, 200/1 = 200 lines. Required
memory size = 40x200 = 8000 bytes.
„ Second layer (graphics): 320/8 = 40 characters per line, 200/1 = 200 lines. Required
memory size = 8000 bytes.
1F40H
2nd graphics layer
(8000 bytes)
0000H
1st graphics layer
(8000 bytes)
3E7FH
1F3FH
Figure 8-3: Two Layer Graphics
◎ Register Setup Procedure
SYSTEM SET TC/R calculation
C = 40H
P1 = 30H
P2 = 87H
P3 = 07H
f_OSC = 6 MHz
f_FR = 70 Hz
P4 = 27H
(1/6) x 9 x [TC/R] x 200 = 1/70
P5 = 2FH
[TC/R] = 48, so TC/R = 2FH
P6 = C7H
P7 = 28H
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