Datasheet

Liquid Crystal Display Driver (LCD)
Technical Data MC68HC908LJ12 — Rev. 2.1
332 Liquid Crystal Display Driver (LCD) Freescale Semiconductor
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.
Figure 16-12. 7-Segment Display Example
FP CONNECTION BP CONNECTION
a
f
e
b
c
g
d
BP0 (a, b COMMONED)
BP1 (c, f, g COMMONED)
BP2 (d, e COMMONED)
a
f
e
b
c
g
d
FP2
The segment assignments for each bit in the data registers are:
To display the character "4": LDAT1 = X010X01X, LDAT2 = XXXXXX11
agd— —fe—
FP0
———— bc——
FP1
010X X10X
XXXX 11XX
FP0 (e, f COMMONED)
FP1 (a, d, g COMMONED)
FP2 (b, c COMMONED)
F0B0F0B1F0B2F0B3F1B0F1B1F1B2F1B3
LDAT1
$0052
LDAT2
$0053
F2B0F2B1F2B2F2B3F3B0F3B1F3B2F3B3
LDAT1
$0052
LDAT2
$0053
a
f
e
b
c
g
d
X = don’t care