Datasheet

9.4 Mode Set
The display mode is defined by this command. The display mode does not change until the next
command is sent. The logical OR, EXOR, AND of text or graphic display can be displayed.
In internal Character Generator mode, character codes 00h to 7Fh are assigned to the built-in
Character generator ROM. The character codes 80h to FFh are automatically assigned to the
external character generator RAM.
Note: Attribute functions can only be applied to text display, since the attribute data is placed in
the graphic RAM area.
Attribute Function
The attribute operations are Reverse display, Character blink, bold and Inhibit. The attribute data is
written into the graphic area, which was defined by the Set Control word command. Only text
display is possible in Attribute Function mode; graphic display is automatically disabled. However,
the Display Mode command must be used to turn both Text and Graphic on that in order to for the
Attribute function available.
The attribute data for each character in the text area is written to the same address in the graphic
area.
The Attribute function is defined as follows.