LC75817 datasheet(9/43 Pages) SANYO

Part #	LC75817

Description	1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function

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Manufacturer	SANYO [Sanyo Semicon Device]

Direct Link	https://www.sanyo-av.com/us/

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No. 6144-9/43

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

1

2

3

4

56789

10

11

12

ADRAM address (hexadecimal)

0

1

2

3

456789

A

B

However, when the display shift is performed by specifying ADATA, the ADRAM address shifts as shown below.

Display digit

1

2

3

4

56789

10

11

12

ADRAM address (hexadecimal)

1

2

3

4

56789

A

B

0

(Left shift)

Display digit

1

2

3

4

56789

10

11

12

ADRAM address (hexadecimal)

B

0

1

2

3456789

A

(Right shift)

Note: *5. The ADRAM addresses are expressed in hexadecimal.

Example: When the ADRAM address is AH

Note: *6. 5

× 7 dots ... 12-digit display

5 dots

5

× 8 dots ... 12-digit display

5 dots

5

× 9 dots ... 12-digit display

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.

ADRAM address

RA0

RA1

RA2

RA3

RA0

RA1

RA2

RA3

0101

Hexadecimal

Least significant bit

↓

LSB

Most significant bit

↓

MSB

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