External generator mode.
The senior five bits define the start address in external memory of the CG RAM area. The next
eight bits represent the character code of the character. In internal CG ROM, character codes 00H
to 7FH represent the predefined “internal” CG ROM characters, and codes 80H to FFH represent
the user’s own “external” characters. In external CG ROM mode, all 256 codes from 00H to FFH
can be used to represent the user’s
own characters. The three
least significant bits indicate one of
the eight rows of eight dots that define the character’s shape.
The relationship between display RAM address and offset register
"
Offset register data
""""""""CG RAM hex. address (start to end)
""
00000
"""""""""""""
0000 to 07 FFH
""
00001
""""""""""" "
0800 to 0FFFH
00010 1000 to 17FFH
""
11100
"""""""""""" "
E000 to E7FFH
""
11101
"""""""""""""
E800 to EFFFH
""
11110
"""""""""""""
F000 to F7FFH
""
11111
"""""""""""""
F800 to FFFFH
(Example 1)
Offset register""""""""""""
02H
Character code"""""""""
80H
Character generator RAM start address""
0001 0100 0000 0000
1 4 0 0 H
(Example 2) The relationship between display RAM data and display characters
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