ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 15

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
Notes:
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
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.
Parameter
movement
Cursor
SAD1
SAD2
SAD3
SAD4
range
TC/R
C/R
SL1
SL2
L/F
First screen block
Second screen
block
Third screen block
Continuous movement over whole screen
Figure 6-5: IV and HDOT SCR Adjustment
00H to L/F
00H to L/F
Invalid
IV = 1
TC/R
HDOT SCR
C/R
Character
L/F
Display start point
W/S = 0
Dots 1 to 7
Table-2: LCD Parameters
TC/R (See note 1.)
00H to L/F + 1
(See note 2.)
00H to L/F + 1
(See note 2.)
First screen block
Second screen
block
Third screen block
15/88
IV
Invalid
IV = 0
C/R
L/F
First screen block
Second screen
block
Third screen block
Fourth screen block
Above-and-below configuration:
continuous movement over whole screen
(L/F) / 2
(L/F) / 2
IV = 1
TC/R
C/R
L/F
Dot Matrix LCD Controller
W/S = 1
RA8835A
www.raio.com.tw
First screen block
Second screen
block
Third screen block
Fourth screen block
(L/F) / 2
(L/F) / 2
IV = 0
TC/R
C/R
L/F