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CM16022ASFAYA-03 Datasheet PDF : 26 Pages
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10.5 CGRAM
Relationship between CGRAM Addresses, Character Codes (DDRAM) and
Patterns (CGRAM Data)
For 5×8 dot character patterns
Character Codes
(DDRAM data)
76543210
CGRAM Address
543210
High
Low
0000∗000
0000∗001
High
000
001
Low
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
000
001
Character Patterns
(CGRAM data)
76543210
High
Low
∗∗ ∗ 1 1 1 1 0
10001
10001
11110
10100
Character
Pattern (1)
10010
10001
∗ ∗ ∗ 0 0 0 0 0 } Cursor position
∗∗ ∗10001
01010
11111
00100
11111
Character
Pattern (2)
00100
00100
∗ ∗ ∗ 0 0 0 0 0 } Cursor position
∗∗ ∗
0000∗111
111
100
101
110
111
∗∗ ∗
Notes : 1. Character code bits 0 to 2 correspond to CGRAM address bits 3 to 5 (3 bits: 8 types).
2. CGRAM address bits 0 to 2 designate the character pattern line position. The 8th line
is the cursor position and its display is formed by a logical OR with the cursor.
Maintain the 8th line data, corresponding to the cursor display position, at 0 as the
cursor display.
If the 8th line data is 1, 1 bits will light up the 8th line regardless of the cursor presence.
3. Character pattern row positions correspond to CGRAM data bits 0 to 4 (bit 4 being
at the left).
4. As shown Table 5, CGRAM character patterns are selected when character code bits
4 to 7 are all 0. However, since character code bit 3 has no effect, the R display example
above can be selected by either character code 00H or 08H.
5. 1 for CGRAM data corresponds to display selection and 0 to non-selection.
∗ Indicates no effect.
Page: 17 / 26
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