Figure 3-1 Combination Of Iv And Hdot Scr; Table 3-1 W/S Related Registers - Epson S1D13700 User's & Technical Manual

3: COMMANDS AND COMMAND REGISTERS
W/S Selects the LCD unit drive method.
W/S
Parameter
C/R
TC/R
L/F
SL1
SL2
SAD1
SAD2
SAD3
SAD4
Cursor
Note: 1. For details on how to set C/R and TC/R when using the HDOT SCR command, see Section
4.1.6 "Determining Various Parameters" on page 64.
2. The SL value for IV = 0 is the SL value for IV = 1 plus 1.
IV Corrects the screen origin during inverse display. Normally set IV = 1.
The most effective way to display characters in inverse video is to use a unique function of the
S1D13700 that allows the text screen and graphics back-layered screen to be exclusive OR'd.
However, because the character origin is at the upper-left corner of the screen when characters
are mapped on the screen by the S1D13700, the uppermost line and leftmost column on the
display screen do not have dots to draw the outline of characters, thus making the displayed
characters illegible. Therefore, the S1D13700 uses the IV specification and horizontal direction
dot scroll function (HDOTSCR command) to shift the origin of the text screen for correction
with respect to the graphics back-layered screen, allowing characters to be displayed in inverse
video anywhere on the screen. For details, see Section 4.1.7 "Scrolling" on page 65.
Background layer
Note: If the leftmost column must also be corrected, shift dots in the horizontal direction.
20
0: Single-screen drive method
1: Dual-screen drive method

Table 3-1 W/S Related Registers

W/S = 0
IV = 1
C/R
TC/R
L/F
00H – L/F
00H – L/F
First screen block First screen block
Second screen block Second screen block
Third screen block Third screen block
Invalid
Successively movable on all screens
IV 0: Uppermost line of screen corrected
1: Uppermost line of screen not corrected
Origin of the screen
HDOT SCR
Text
1 – 7 dots
<Display screen>

Figure 3-1 Combination of IV and HDOT SCR

IV = 0
C/R
TC/R
L/F
00H – L/F + 1
00H – L/F + 1
First screen block
Second screen block
Third screen block
Invalid Fourth screen block
Upper/lower screen configuration: Successively
IV
EPSON
W/S = 1
IV = 1 IV = 0
C/R C/R
TC/R TC/R
L/F
(L/F)/2 (L/F)/2
(L/F)/2 (L/F)/2
First screen block
Second screen block
Third screen block
Fourth screen block
movable on all screens
1 dot
S1D13700 Technical Manual
L/F