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■ Plane size register

The plane size register controls the specification of the plane size and the screen over processing of the rotating scroll screen. This is a write-only 16-bit register located at 18003AH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Plane size bit : Plane size bit

(N0PLSZ1, N0PLSZ0, N1PLSZ1, N1PLSZ0, N2PLSZ1, N2PLSZ0, N3PLSZ1, N3PLSZ0, RAPLSZ1, RAPLSZ0, RBPLSZ1, RBPLSZ0)
∙ Specify the plain size (number of pages) for each scroll screen.

N0PLSZ1, N0PLSZ0 18003AH bit 1,0 For NBG0
N1PLSZ1, N1PLSZ0 18003AH Bit 3, 2 For NBG1
N2PLSZ1, N2PLSZ0 18003AH bits 5, 4 For NBG2
N3PLSZ1, N3PLSZ0 18003AH bits 7,6 For NBG3
RAPLSZ1, RAPLSZ0 18003AH bits 9,8 Rotation parameter A For
RBPLSZ1, RBPLSZ0 18003AH bits 13,12 Rotation parameter B For

xxPLSZ1 xxPLSZ0 Plain size
0 0 1 horizontal page x 1 vertical page
0 1 2 horizontal pages x 1 vertical page
1 0 Setting prohibited (Do not set)
1 1 2 horizontal pages x 2 vertical pages
[Note] N0, N1, N2, N3, RA, or RB is entered in the bit name xx.

NB If NBG0 and NBG1 are set so that they can be reduced to 1/4, the plane size of the screen should not be 2 horizontal pages x 2 vertical pages.

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