Epson S1D13506 Technical Manual page 186

Page 180
Transparent Move BitBLT
Color Expansion
Move BitBLT with Color Expansion
S1D13506
X25B-A-001-12
The Transparent Move BitBLT supports bit block transfers from display buffer to display
buffer in positive direction only.
When the source color is equal to key color, which is defined in Background Color
Register, the destination area is not updated. In 8 bpp mode, only the low byte of key color
is used for comparison.
For this BitBLT no raster operation is applied.
The Color Expansion BitBLT expands the host's monochrome data to 8 or 16 bpp color
format.
A 1 expands to the color defined in the Foreground Color Register. In 8 bpp mode, only the
low byte of the Foreground Color Register is used.
A 0 expands to the color defined in the Background Color Register. In 8 bpp mode, only
the low byte of the Background Color Register is used. If background transparency is
enabled, then the destination color will remain untouched.
The host will be continuously feeding a 16-bit data package. When the end of the line is
reached, any unused bits will be discarded. The data for the next line will be taken from the
next data package. The low byte write data will be used first for the operation. Each bit is
serially expanded to the destination data starting from MSB (Bit 7) to LSB (Bit 0).
This BitBLT supports any bit alignment, but supports in a positive direction only.
The Move BitBLT with Color Expansion expands off-screen source's monochrome data to
8 or 16 bpp color format.
A 1 expands to the color defined in the Foreground Color Register.
A 0 expands to the color defined in the Background Color Register. If background trans-
parency is enabled, then the destination color will remain untouched.
In 8 bpp mode, only the low byte of the Foreground Color Register and Background Color
Register are used for color expansion. The low byte write data will be used first for the
operation. Each bit is serially expanded to the destination data starting from MSB (Bit 7) to
LSB (Bit 0).
This BitBLT supports byte alignment only and supports in a positive direction only.
Epson Research and Development
Vancouver Design Center
Hardware Functional Specification
Issue Date: 02/03/26