Saw no mention of the display data command in the documentation. Maybe the same lcd is available elsewhere with another datasheet?
Page 3 tells you about 2 colors.You have the option to have Deep blue by switching on the pixel, or the alternative of Yellow green by turning it off.It is a monochrome display.Just take a peek at the remarks to those lines where it says "The Color is defined as the inactive/background color"
I was about to ask if this might be a feature of 8 bit mode, because I can't seem to find an application where 8 bit mode would even be used.
The 8-bit mode is really just a carryover from the olden days when the LCD was hooked onto the data bus of an 8-bit microprocessor and treated just like any other memory mapped device. It does not provide any added features and there is little reason to consider it except when you are starting out to learn how to control one of these displays on your own, without using a library written by others.Don