SCDQ5541P/Q/R, SCDQ5542P/Q/R, SCDQ5543P/Q/R, SCDQ5544P/Q/R

2010-04-13

9

The Character Address bits, D4–D0 stored in the Character

Address Register and the Column Data Instruction’s Row Address

bits, D7–D5, direct the Column Data bits, D4–D0 to specific RAM

location. See the Instruction Set Table for address and data format.

Figure „Writing Character ’D’ Example“ (page 9) shows the Row

Address for the example character “D” See Figure „Character

Address, Row, & Column Data Map“ (page 7) for the dot

positioning (Display contacts are at the top of the display).

Column data is written and read asynchronously from the 200 bit

RAM. Once loaded the internal oscillator and character multiplexer

reads the data from the RAM. These characters are row strobed

with column data as shown in Figure „Row Strobe Example“

(page 10). The character strobe rate is determined by the internal

IC’s÷320 counter.

Row and Column Locations for a Character “D”

Instruction Set

OPERATION

D

7

D

6

D

5

D

4

D

3

D

2

D

1

D

0

HEX

DESCRIPTION

CONTROL WORD

1

1

1

1

L

T

B

r

B

r

B

r

F0+X

Select Control Word plus

operand

See Control Word Format

Power Down Mode

1

1

1

1

1

1

1

1

FF

Power Down Mode–0%

Brightness

SFT CLEAR

1

1

0

0

0

0

0

0

C0

Software Clear

ADDRESS

1

0

1

0

0

0

0

0

A0

Select Digit Address 0

REGISTER

1

0

1

0

0

0

0

1

A1

Select Digit Address 1

CHR ADRS

1

0

1

0

0

0

1

0

A2

Select Digit Address 2

0–3

1

0

1

0

0

0

1

1

A3

Select Digit Address 3

COLUMN DATA

0

0

0

D

4

D

3

D

2

D

1

D

0

00+X

Row 0

D4–D0=Column Data

0

0

1

D

4

D

3

D

2

D

1

D

0

20+X

Row 1

D4–D0=Column Data

0

1

0

D

4

D

3

D

2

D

1

D

0

40+X

Row 2

D4–D0=Column Data

0

1

1

D

4

D

3

D

2

D

1

D

0

60+X

Row 3

D4–D0=Column Data

1

0

0

D

4

D

3

D

2

D

1

D

0

80+X

Row 4

D4–D0=Column Data

Row data is written to the character address contained in the Character Address Register.

Writing Character “D” Example

Op code

D7

D6

D5

Column Data

D4

D3

D2

D1

D0

C0

C1

C2

C3

C4

Hex

Row 0

00

0

11

1

1

0

1E

Row 1

00

1

10

0

0

1

31

Row 2

01

0

10

0

0

1

51

Row 3

01

1

10

0

0

1

71

Row 4

10

0

11

1

1

0

9E

IDXX5181

Row 0

Row 1

Row 2

Row 3

Row 4

01

2

3

4

Previously "on" LED

On LED

Off LED

Columns