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When using the color calculation mode that adds according to the value of the color calculation ratio, the color calculation ratio value for each screen is set in the register. The sprite's color calculation ratio can be specified for each character from a maximum of eight register values, and the scroll screen color calculation ratio is specified in a register that has one on each side. For the color calculation ratio of sprites, refer to “ Color calculation ratio register ” in “ 9.2 Priority and color calculation ”. The color calculation ratio for each screen is specified by 5 bits, and the top image: second image = 31: 1 to 0:32 can be specified in total 32 steps. There are two types. 

 (1) Specify on the top image side
(2) Specify on the second image side

When specifying on the top image side, regardless of the screen of the second image, the sprite that became the top image or the color calculation ratio value of the scroll screen will be used. Also, when specifying on the second image side, the color calculation ratio can be changed depending on the screen of the second image, and the color calculation ratio values ​​of the line color screen and the back screen as well as the sprite and scroll screen are used.
When using the color calculation mode that adds values ​​as they are, the top image fades in on the second image by gradually rewriting the color data of the top image from 00H to the original color. The However, please note that the color of the addition result will be brighter than it is at the same time. If the addition result exceeds FFH, it is set to FFH. Figure 12.2 shows the color calculation ratio mode.

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