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Table 6.4 Image processing with the most significant bit value of coefficient data for RBG0
Rotation parameter
Data
Mode 		Rotation
Parameter 		Most significant
bit function 		Most significant
bit value 		Image processing
0 A Transparent 0
Display the image obtained using the coefficient data
1 Forcibly make dots using the coefficient data transparent
Bright dots
B Do not use - -
1 A Do not use - -
B Transparent 0 Using the coefficient data
Display the resulting image
1 Forcibly make dots using the coefficient data transparent
Bright dots
2 A Parameter
Switch 		0
Display the image obtained using the coefficient data
1 Invalidate the coefficient data and display the image obtained by the rotation parameter B
B Transparent 0 Using the coefficient data
Display the resulting image
1 Forcibly make dots using the coefficient data transparent
Bright dots
3 A, B Transparent 0
Display the image obtained using the coefficient data
1 Forcibly make dots using the coefficient data transparent
Bright dots

■ RAM control register

The RAM control register specifies the VRAM bank division, the purpose of use of the VRAM on the rotary scroll screen, and the color RAM mode. This is a 16-bit readable / writable register located at 18000EH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Color RAM coefficient table enable bit : Color RAM coefficient table enable bit (CRKTE), bit 15

Specify whether to store the coefficient table in color RAM.

CRKTE Process
0 Store coefficient table in VRAM
1 The coefficient table is stored in color RAM

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