S1D13700F02 Epson Electronics America, Inc., S1D13700F02 Datasheet - Page 62

• Manufacturer Part Number: S1D13700F02
• Description: Embedded Memory Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 62
OVLAY
bit 4
bit 3
bit 2
S1D13700F02
X42D-A-001-01
REG[18h] Overlay Register
Address = 8018h
7
n/a
6
Default = 00h
Note
Note
The OVLAY command selects layered screen composition and screen text/graphics mode
when indirect addressing is used. The values from REG[18h] are passed as parameters
when the OVLAY command is issued. For further information on the OVLAY command,
see Section 11.1.7, “OVLAY” on page 73.
3 Layer Overlay Select (OV)
This bit determines how many layers are used when graphics mode is enabled. For mixed
text and graphics, this bit must be set to 0.
When this bit = 0, two layers are used.
When this bit = 1, three layers are used.
Screen Block 3 Display Mode (DM1)
This bit determines the display mode for screen block 3.
When this bit = 0, screen block 3 is configured for text mode.
When this bit = 1, screen block 3 is configured for graphics mode.
Screen Block 1 Display Mode (DM0)
This bit determines the display mode for screen block 1.
When this bit = 0, screen block 1 is configured for text mode.
When this bit = 1, screen block 1 is configured for graphics mode.
Screen blocks 2 and 4 can display graphics only.
Screen blocks 2 and 4 can display graphics only.
5
3 Layer Overlay
Select
4
Revision 1.01
Screen Block 3
Display Mode
3
Screen Block 1
Display Mode
2
Epson Research and Development
Hardware Functional Specification
Layer Composition Method bits 1-0
1
Vancouver Design Center
Issue Date: 2005/11/29
Read/Write
0