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■ Window control register

Window control register specifies how to use the window for each screen. This is a write-only 16-bit register located at addresses 1800D0H to 1800D6H. The value is cleared to 0 after power-on or reset, so be sure to set it.

Window logic bit : Logic bit

(N0LOG, N1LOG, N2LOG, N3LOG, R0LOG, SPLOG, RPLOG, CCLOG)
∙ Specify how to overlay windows used on each screen.

N0LOG 1800D0H bit 7 NBG0 in transparency window (Or RBG1)
N1LOG 1800D0H Bit 15 For NBG1 (or EXBG) in the transparency window
N2LOG 1800D2H Bit 7 Transparency processing window for NBG2
N3LOG 1800D2H Bit 15 Transparency processing window for NBG3
R0LOG 1800D4H Bit 7 Transparency processing window for RBG0
SPLOG 1800D4H Bit 15 For transparent processing window sprites
RPLOG 1800D6H Bit 7 For rotation parameter window
CCLOG 1800D6H Bit 15 For color operation window

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