Chapter 6 Command Table

6.1 CMDCTRL (control word)

CMDCTRL specifies the command, controls the command table, reverses the sprite and specifies the fixed point. CMDCTRL is 16 bits at the command table start address + 00H, and the bit configuration is as follows. Set unused bits to 0.

End bit: end bit (END), bit 15

Indicates a drawing end command. The command selection bit is valid when it is not a drawing end command.

Jump format: Jump select (JP), bits 14-12

Indicates how to specify the command table to be read (fetched) next.

Zoom point bit: zoom point (ZP), bits 11-8

Indicates the zoom point (fixed point) for the rectangular sprite drawing command. The zoom point specifies the reference point for inversion and enlargement / reduction.

Character reading direction bit: character read direction (Dir), bits 5-4

Indicates the reading direction from the character pattern table when using the texture drawing command.

Command selection bit: command select (Comm), bits 3 to 0

Indicates the command function. Command selection is invalid when the end bit is the end command.