LC75817E Datasheet, PDF (9/43 Pages) Sanyo Semicon Device – 1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function

LC75817E, 75817W
• ADRAM (Additional data RAM)
ADRAM is RAM used to store the ADATA display data. ADRAM has a capacity of 12 × 5 bits, and the stored display
data is displayed directly without the use of CGROM or CGRAM. The table below lists the correspondence between
the 4-bit ADRAM address loaded into AC and the display position on the LCD panel.
• _{When the ADRAM address loaded into AC is 0H. (Number of digit displayed: 12)}
Display digit
ADRAM address (hexadecimal)
1
2
3
4
5
6
7
8
9 10 11 12
0
1
2
3
4
5
6
7
8
9
A
B
However, when the display shift is performed by specifying ADATA, the ADRAM address shifts as shown below.
Display digit
ADRAM address (hexadecimal)
1
2
3
4
5
6
7
8
9 10 11 12
1
2
3
4
5
6
7
8
9
A
B
0 (Left shift)
Display digit
ADRAM address (hexadecimal)
1
2
3
4
5
6
7
8
9 10 11 12
B
0
1
2
3
4
5
6
7
8
9
A (Right shift)
Note: *5. The ADRAM addresses are expressed in hexadecimal.
Least significant bit
↓
LSB
ADRAM address RA0
RA1
Most significant bit
↓
MSB
RA2
RA3
Hexadecimal
Example: When the ADRAM address is A_H
RA0
RA1
RA2
RA3
0
1
0
1
Note: *6. 5 × 7 dots ... 12-digit display
5 × 8 dots ... 12-digit display
5 × 9 dots ... 12-digit display
5 dots
5 dots
4 dots
• CGROM (Character generator ROM)
CGROM is ROM used to generate the 240 kinds of 5 × 7, 5 × 8, or 5 × 9 dot matrix character patterns from the 8-bit
character codes. CGROM has a capacity of 240 × 45 bits. When a character code is written to DCRAM, the character
pattern stored in CGROM corresponding to the character code is displayed at the position on the LCD corresponding to
the DCRAM address loaded into AC.
• CGRAM (Character generator RAM)
CGRAM is RAM to which user programs can freely write arbitrary character patterns. Up to 16 kinds of 5 × 7, 5 × 8,
or 5 × 9 dot matrix character patterns can be stored. CGRAM has a capacity of 16 × 45 bits.
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