MC68HC908LJ12 Datasheet, PDF (331/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Liquid Crystal Display Driver (LCD)
16.8 Seven Segment Display Connection
The following shows an example for connecting a 7-segment LCD
display to the LCD driver.
The example uses 1/3 duty cycle, with pins BP0, BP1, BP2, FP0, FP1,
and FP2 connected as shown in Figure 16-12. The output waveforms
are shown in Figure 16-13.
FP CONNECTION
a
BP CONNECTION
a
f
g
b
f
g
b
BP0 (a, b COMMONED)
ed
c
ed
c
BP1 (c, f, g COMMONED)
BP2 (d, e COMMONED)
FP2 (b, c COMMONED)
FP1 (a, d, g COMMONED)
FP0 (e, f COMMONED)
The segment assignments for each bit in the data registers are:
F1B3 F1B2 F1B1 F1B0 F0B3 F0B2 F0B1 F0B0
LDAT1
$0052
—
d
g
a
—
e
f
—
FP1
FP0
F3B3 F3B2 F3B1 F3B0 F2B3 F2B2 F2B1 F2B0
LDAT2
$0053
—
—
—
—
—
—
c
b
FP2
To display the character "4": LDAT1 = X010X01X, LDAT2 = XXXXXX11
LDAT1
$0052
X
0
1
0
X
0
1
X
LDAT2
$0053
X
X
X
X
X
X
1
1
X = don’t care
a
fg
b
ed
c
Figure 16-12. 7-Segment Display Example
Technical Data
332
Liquid Crystal Display Driver (LCD)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor