Page 62
Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
bit 7
DISP
This bit selects display on or off. When this bit = 0, Display OFF is selected (LD0-3 and UD0-3 are forced
to 0 ). When this bit = 1, Display ON is selected. This bit goes low on RESET.
bit 6
Panel
This bit selects the LCD panel configuration (single or dual). When this bit = 0, Single LCD panel drive is
selected. When this bit = 1 Dual LCD panel drive is selected. This bit goes low on RESET.
bit 5
Mask XSCL
XSCL is automatically masked during the horizontal non-display period if any of the following criteria is
met:
• AUX[0C] value is greater than 00h.
• Color panel is selected.
• This bit (AUX[01] bit 5) = 1.
.
XSCL will not be masked during the horizontal non-display period if color panel is not selected, AUX[0C]
= 00h and this bit = 0.
bit 4
LCDE
The state of this pin determines the state of output pin 82, LCDENB, and is intended for control of an
external LCDBIAS power supply. However, this pin can be used as a general I/O pin if desired. When
LCDE = 0, LCDENB is forced low. When LCDE = 1, LCDENB is forced high. LCDE goes low on
RESET.
bit 3
Gray Shade/Color
In gray shade display modes, this bit selects between 16-level or 4-level gray shade display. When this bit
= 1, 16 gray shades are displayed (4 bits/pixel). When this bit = 0, 4 gray shades of a possible 16 are dis-
played (2 bits/pixel).
In color display modes, this bit selects between 16 color or 4 color display. When this bit = 1, 16 colors are
displayed out of a possible of 4096 colors (4 bits/pixel). When this bit = 0, 4 colors are displayed out of a
possible of 4096 colors (2 bits/pixel).
This bit is ignored when either black-and-white (BW) or 256 color mode is selected (AUX[03] bit 2 = 1).
This bit goes low on RESET.
AUX[01] Mode Register 0
I/O address = 0001b, Read/Write.
DISP
Panel
Mask
XSCL
LCDE
Gray Shade /
Color
LCD Data
Width Bit 0
Memory
Interface
RAMS
Table 8-1: Gray Shade/Color Mode Selection
Display
Modes
Gray Shade/
Color
AUX[01] bit 3
BW/
256 Colors
AUX[03] bit 2
Color Mode
AUX[03] bit 1
256 Colors
don’t care
1
1
16 Colors
1
0
1
4 Colors
0
0
1
16 Grays
1
0
0
4 Grays
0
0
0
BW
don’t care
1
0
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