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■ Vertical cell scroll table address register

Vertical cell scroll table address register specifies the start address of the vertical cell scroll table. This is a write-only 32-bit register located at addresses 18009CH to 18009EH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Vertical cell scroll table address bit : Vertical cell scroll table address bit (VCSTA18 to VCSTA1)

Specify the top address of the vertical cell scroll table on VRAM.

VCSTA18 to VCSTA16 18009CH Bits 2 to 0 <
VCSTA15 to VCSTA1 18009EH Bits 15 to 1

The actual start VRAM address is calculated by the following formula. If the VRAM capacity is 4M bits, the most significant bit of the address is ignored. 

 (vertical cell scroll table start address) = (vertical cell scroll table address register value 18 bits) × 4H

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