Datasheet

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
E
xample: Serial Clock=5.0 MHz, Clock Period=200 ns
Time between Loads
LOAD
Serial
Clock
DATA
Clock
Period
t
0
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 0 000 11110 1E
Row 1 000 10001 11
Row 2 000 10001 11
Row 3 000 10001 11
Row 4 000 10001 11
Row 5 000 10001 11
Row 6 000 11110 1E
IDXX5183
Row 2
Row 3
Row 4
Row 5
Row 6
01234
On LED
Off LED
Columns
Row 0
Row 1