PT6880 Datasheet, PDF (12/42 Pages) Princeton Technology Corp – OLED Driver/Controller IC

OLED Driver/Controller IC
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Preliminary
PT6880
CHARACTER Generator RAM (CGRAM)
The Character Generator RAM (CGRAM) is used to generate either 5 x 8 dot or 5 x 10 dot character
patterns. It can generate eight 5 x 8 dot character patterns and four 5 x 10 dot character patterns. The
character patterns generated by the CGRAM can be rewritten. User-defined character patterns for
the CGRAM is supported. Areas in the CGRAM that are not used for display may be used as the
General Data RAM.
RELATIONSHIP BETWEEN CGRAM ADDRESS, DDRAM CHARACTER CODE AND
CGRAM CHARACTER PATTERNS (FOR 5 X 8 DOT CHARACTER PATTERN)
Character Codes (DDRAM Data)
76 5 4 3 2 1 0
High
Low
00 0 0 * 0 0 0
00 0 0 * 0 0 1
CGRAM Address
543210
High
000
001
010
011
000
100
101
110
111
000
001
010
001011
100
101
110
111
000
001
Character Patterns (CGRAM Data)
76543210
High
Low
***11110
***10001
***10001
***11110
***10100
***10010
***10001
***00000
***10001
***01010
***11111
***00100
***11111
***00100
***00100
***00000
***
***
Character Pattern 1
Cursor Position
Character Pattern 2
Cursor Position
00 0 0 * 1 1 1
100
111101
110
111
***
***
***
***
Notes: 1. * = Not Relevant
2. The character pattern row positions correspond to the CGRAM data bits -- 0 to 4, where bit
4 is in the left position.
3. Character Code Bits 0 to 2 correspond to the CGRAM Address Bits 3 to 5 (3 bits : 8 types)
4. If the CGRAM Data is set to "1", then the selection is displayed. If the CGRAM is set to
"0", there no selection is made.
5. The CGRAM Address Bits 0 to 2 are used to define the character pattern line position. The
8th line is the cursor position and its display is formed by the logical OR with the cursor.
The 8th line CGRAM data bits 0 to 4 must be set to "0". If any of the 8th line CGRAM data
PT6880 pre 1.1
Page 12
Mar. 2002