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■ Transparent pixel disabled

Transparent pixel disable bit: See-through pixel disable (SPD), bit 6
Specify whether to disable the transparent pixel of the character pattern. When 0, transparent pixels are enabled, and when 1, transparent pixels are disabled.
透明 Transparent pixel invalid bit is valid only for sprite drawing with character pattern. Be sure to set this bit to 1 for polygons, polylines, and lines.
If the transparent pixel is valid (SPD = 0), the transparent color code in the character pattern is a transparent pixel and is not drawn. When the end code is disabled (SPD = 1), the transparent color code is processed in the same way as other color codes.
Note that when transparent pixels are enabled (SPD = 0), the number of colors that can be used is one less. For example, when ECD = 0, SPD = 0, and color mode = 0, only 14 colors can be displayed. 

 SPD 
 Transparent pixel processing 
 0 
 Transparent pixel enabled, does not draw transparent color code, 
 Transparent color code is transparent 
 1 
 Transparent pixel disabled, transparent color code is not processed, 
 Draw in the color as code

The relationship between the color mode and transparent color code is as follows. The number of bits of the transparent color code differs in color mode. 

 Color Mode 
 Transparent Color Code 
 0 
 16 colors (color bank mode) 
 0H (4 bits) 
 1 
 16 colors (lookup table mode) 
 0H (4 bits) 
 2 
 64 colors (color bank mode) 
 00H (8 bits) 
 3 
 128 colors (color bank mode) 
 00H (8 bits) 
 4 
 256 colors (color bank mode) 
 00H (8 bits) 
 5 
 32768 colors (RGB mode) 
 0000H (16 bits)

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