SCE5740, SCE5741, SCE5742, SCE5743, SCE5744, SCE5745

2006-03-30

8

Loading Serial Character Data

Table „Character ’D’“ (page 8) shows the Row Address for the

example character “D.” Column data is written and read asynchro-

nously from the 140 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 Figures

„Row and Columns Locations for a Character ’D’“ (page 8) and

„Row Strobing“ (page 9). The character strobe rate is determined

by the internal or user supplied external MUX Clock, the IC’s

counter and the prescaler.

Row and Column Locations for a Character “D”

Character 0

Character 1

Character 2

Character 3

352 Clock Cycles, 70.4

µs

Example: Serial Clock=5.0 MHz, Clock Period=200 ns

Time between Loads

LOAD

Serial

Clock

DATA

Clock

Period

t0

D0

D1

D2

D3

D4

D5

D6

D7

11 Clock Cycles, 2.2

µs

Time

Between

Loads

600ns(min)

OPCODE

Character Address

OPCODE

Column Data

D0

D

D1

D

D2

D

D3

D

D4

D

11 Clock Cycles, 2.2

µs

Character 0

Address

Row 0

Column Data

Row 1

Column Data

Row 2

Column Data

Row 3

Column Data

Row 4

Column Data

Row 5

Column Data

Row 6

Column Data

88 Clock Cycles, 17.6

µs

D0

0

D1

0

D2

0

D3

0

D4

0

D5

1

D6

0

D7

1

a.

b.

c.

d.

D5

0

D6

0

D7

0

Time

Between

Loads

600ns(min)

Character “D”

Op code

D7

D6 D5

Column Data

D4

D3

D2

D1

D0

C0

C1

C2

C3

C4

Hex

Row 0

00

0

1

1

110

1E

Row 1

00

0

1

0

001

11

Row 2

00

0

1

0

001

11

Row 3

00

0

1

0

001

11

Row 4

00

0

1

0

001

11

Row 5

00

0

1

0

001

11

Row 6

00

0

1

1

110

1E

IDXX5183

Row 2

Row 3

Row 4

Row 5

Row 6

01

2

3

4

On LED

Off LED

Columns

Row 0

Row 1