NXP Semiconductors MC9S08LG16, Reference Manual

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Chapter 8 LCD Module (S08LCDLPV1)
MC9S08LG32 MCU Series, Rev. 5
196 Freescale Semiconductor
LCDWF contents and output waveforms are also shown. Output waveforms are illustrated in Figure 9-18
and Figure 9-19 .
Figure 9-18. Waveform Output from LCDWF Registers
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
The above segment assignments are provided by the specification for the LCD glass for this example.
To display the character “4”: LCDWF0 = XXXXX01X, LCDWF1 = XXXXX010, LCDWF2 =XXXXXX11
FP0 (e, f COMMONED)
FP1 (a, d, g COMMONED)
FP2 (b, c COMMONED)
a
f
e
b
c
g
d
X = don’t care
For this LCD Module any of the LCD pins can be configured to be Frontplane 0-2 or Backplane 0-2.
For this example we will set LCD[0] as FP0, LCD[1] as FP1, and LCD[2] as FP2.
For this example we will set LCD[3] as BP0, LCD[4] as BP1 and LCD[5] as BP2.
Backplane assignment is done in the LCDWF register as shown below:
0 0 0 0 1 0 0 0
LCDWF3
0 0 0 0 0 1 0 0
LCDWF4
0 0 0 0 0 0 1 0
LCDWF5
With the above conditions the segment assignment is shown below:
– – – – – f e –
LCDWF0
– – – – a g d –
LCDWF1
– – – – b c – –
LCDWF2
X X X X X 1 0 X
LCDWF0
X X X X 0 1 0 X
LCDWF1
X X X X 1 1 X X
LCDWF2