RA8835A
Version 1.0
Dot Matrix LCD Controller
Table-2: LCD Parameters
W/S = 0
W/S = 1
Parameter
IV = 1
C/R
IV = 0
IV = 1
IV = 0
C/R
C/R
TC/R
L/F
C/R
C/R
TC/R
L/F
TC/R
L/F
TC/R (See note 1.)
TC/R
L/F
L/F
00H to L/F + 1
(See note 2.)
00H to L/F + 1
(See note 2.)
SL1
00H to L/F
00H to L/F
(L/F) / 2
(L/F) / 2
(L/F) / 2
(L/F) / 2
SL2
SAD1
SAD2
SAD3
First screen block
Second screen
block
First screen block
Second screen
block
First screen block
Second screen
block
First screen block
Second screen
block
Third screen block
Third screen block
Third screen block
Third screen block
SAD4
Cursor
movement
range
Invalid
Invalid
Fourth screen block Fourth screen block
Above-and-below configuration:
continuous movement over whole screen
Continuous movement over whole screen
Notes:
1. See Table-24 for further details on setting the C/R and TC/R parameters when using
2. The value of SL when IV = 0 is equal to the value of SL when IV = 1, plus one.
6-2-1-6 IV
Screen origin compensation for inverse display. IV is usually set to 1. The best way of displaying
inverted characters is to Exclusive-OR the text layer with the graphics background layer. However,
inverted characters at the top or left of the screen are difficult to read as the character origin is at
the top-left of its bitmap and there are no background pixels either above or to the left of these
characters.
The IV flag causes the RA8835A series to offset the text screen against the graphics back layer by
one vertical pixel. Use the horizontal pixel scroll function (HDOT SCR) to shift the text screen 1 to
7 pixels to the right. All characters will then have the necessary surrounding background pixels that
ensure easy reading of the inverted characters. See Section 11-5 for information on scrolling.
IV = 0: Screen top-line correction
IV = 1: No screen top-line correction
Display start point
IV
HDOT SCR
Character
Dots 1 to 7
Figure 6-5: IV and HDOT SCR Adjustment
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