No. 6144-8/43

LC75817E, 75817W

Block Functions

• AC (address counter)

AC is a counter that provides the addresses used for DCRAM and ADRAM.

The address is automatically modified internally, and the LCD display state is retained.

• DCRAM (data control RAM)

DCRAM is RAM that is used to store display data expressed as 8-bit character codes. (These character codes are

converted to 5

× 7, 5 × 8, or 5 × 9 dot matrix character patterns using CGROM or CGRAM.) DCRAM has a capacity of

48

× 8 bits, and can hold 48 characters. The table below lists the correspondence between the 6-bit DCRAM address

loaded into AC and the display position on the LCD panel.

•

Display digit

1

2

3

4

56789

10

11

12

DCRAM address (hexadecimal)

00

01

02

03

04

05

06

07

08

09

0A

0B

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

Note: *3. The DCRAM addresses are expressed in hexadecimal.

Note: *4. 5

× 7 dots ... 12-digit display

5

× 7 dots

5

× 8 dots ... 12-digit display

5

× 8 dots

5

× 9 dots ... 12-digit display

4

× 9 dots

Display digit

1

2

3

4

56789

10

11

12

DCRAM address (hexadecimal)

01

02

03

04

05

06

07

08

09

0A

0B

0C

(Left shift)

Display digit

1

2

3

4

56789

10

11

12

DCRAM address (hexadecimal)

2F

00

01

02

03

04

05

06

07

08

09

0A

DCRAM address

DA0

DA1

DA2

DA3

DA4

DA5

(Right shift)

Least significant bit

↓

LSB

DA0

DA1

DA2

DA3

DA4

DA5

011101

Most significant bit

↓

MSB

Hexadecimal

Hexadecimal