LCD Control

The LCD control operates on 2 addresses... The second is used soully for writting data to the LCD driver, the first is used to latch the address, as WELL as write data to the controller.

Control code	Description
0x81	Set contrast, 64 possible values. 0x3F = black on black 0x1F = black on white, 0x00 = white on white.

Example of using the LCD Driver to set the contrast to 'optimal' color.

Example 1:
mov XI, 0
mov X, 0x20FE
mov X, 0x81
inc X
mov X, 0x1F''

Example 2: (fast, but possibly unsafe method)
mov XI, 0
mov X, 0x20FE
mov X, 0x81
mov X, 0x1F

As you can see by the second example, writting a value to the control address register also writes data. What ever address was last latched will be written, so you can chain them. This is useful if you know EXACTLY what the values will be, otherwise you can clobber LCD values. I'm assuming that the driver only accepts commands from 0x80 and on, so be careful when using this mode. The first example is is great for doing things like LCD fades since you do not have to reload the address register each time you want to change the contrast.

Return to Pokemon Mini specifications, or Hardware Registers.