Turns on or off white/black reverse printing mode.
When the LSB of n is 0, white/black reverse mode is turned off.
When the LSB of n is 1, white/black reverse mode is turned on.
Only the lowest bit of n is valid.
This command is available for built-in characters and user-defined characters.
When white/black reverse printing mode is on, it also applies to character
spacing set by ESC SP.
This command does not affect bit images, user-defined bit images, bar
characters.
If n is outside the defined range, this command is ignored.
In standard mode, the vertical direction is the paper feed direction, and the horizontal
direction is perpendicular to the paper feed direction. However, when character orientation
changes in 90° clockwise-rotation mode, the relationship between vertical and horizontal
directions is reversed.
When characters are enlarged with different sizes on one line, all the characters on the line
are aligned at the baseline.
The ESC ! command can also turn double-width and double-height modes on or off.
However, the setting of the last received command is effective.In standard mode, the
horizontal motion unit (x) is used..