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Special color operation mode register

Special color calculation mode register specifies the mode of special color calculation function for each scroll screen. This is a write-only 16-bit register at 1800EEH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Special color calculation mode bit

(N0SCCM1, N0SCCM0, N1SCCM1, N1SCCM0, N2SCCM1, N2SCCM0, N3SCCM1, N3SCCM0, R0SCCM1, R0SCCM0)
Specified special color calculation function mode for each scroll screen.

N0SCCM1, N0SCCM0 1800EEH bit 1,0 NBG0 (or RBG1)
N1SCCM1, N1SCCM0 1800EEH bits 3,2 NBG1 (or EXBG)
N2SCCM1, N2SCCM0 1800EEH bits 5,4 NBG2
N3SCCM1, N3SCCM0 1800EEH Bits 7,6 For NBG3
R0SCCM1, R0SCCM0 1800EEH bits 9,8 For RBG0

xxSCCM1 xxSCCM0 Mode Process
0 0 0 Color calculation enable is enabled for each screen Specify
0 1 1 Specify
1 0 2 Color calculation enable is enabled for each dot Specify
1 1 3
Specify with the most significant bit
[Note] N0, N1, N2, N3, or R0 is entered in the bit name xx.

Specified special color calculation mode is valid only when each screen is a top image. It is fixed to mode 0 when not in the top image.
⿟ Do not switch to mode 2 when the color format of the scroll screen is RGB. When mode 3 is specified, color calculation is performed for all dots.
* Do not specify mode 1 and mode 2 in EXBG.

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