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■ Special priority mode register

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

Special priority mode bit : Special priority mode bit

(N0SPRM1, N0SPRM0, N1SPRM1, N1SPRM0, N2SPRM1, N2SPRM0, N3SPRM1, N3SPRM0, R0SPRM1, R0SPRM0)
Specified special priority function mode for each scroll screen.

N0SPRM1, N0SPRM0 1800EAH bit 1,0 For NBG0 (or RBG1)
N1SPRM1, N1SPRM0 1800EAH bits 3,2 For NBG1 ( Or for EXBG)
N2SPRM1, N2SPRM0 1800EAH bits 5,4 For NBG2
N3SPRM1, N3SPRM0 1800EAH bits 7,6 For NBG3
R0SPRM1, R0SPRM0 1800EAH bits 9,8 For RBG0

xxSPRM1 xxSPRM0 Mode Process
0 0 Mode 0 The least significant bit of the priority number is Specify for each screen
0 1 Mode 1 The least significant bit of the priority number is Specify for each character
1 0 Mode 2 The least significant bit of the priority number is Specify for each dot
1 1 - Setting prohibited
[Note] N0, N1, N2, N3, or R0 is entered in the bit name xx.

⿟ Do not set mode 2 when the color format of the scroll screen is RGB mode.
* Do not set any mode other than mode 0 in EXBG.
• Characters or dots with a priority number of 0 are considered transparent.

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