NXP Semiconductors MC9S08LC60, Manual

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Interfacing the LCD MCU to an LCD Glass
Interfacing an LCD to the MC9S08LC60, Rev. 0
Freescale Semiconductor 13
3.3.1 GP3890P Alphanumeric Segment Groups
The alphanumeric segment group for the DEMO9S08LC60 is a modified version of a standard 14-segment
display group. This custom segment group for alphanumeric displays in the GP3890P LCD glass, shown
in
Figure 8 , uses only 13 segments. The difference between this group and a standard 14-segment group
is the single segment “G”, which normally consists of two segments of equal size. The GP3890P has a total
of nine 13-segment displays. Referencing
Figure 6 , the leftmost 13-segment display group is the first
position. With a 13-segment display layout, each alphanumeric character will require 13 bits of MCU LCD
RAM.
Figure 8. GP3980P Custom 13-Segment Display Layout Pattern
3.3.2 Alphanumeric Segment Group MCU LCD RAM Mapping
This section gives an example of the mapping of an alphanumeric segment group for the leftmost
13-segment display (position 1) on the GP3890P to display the letter “M”.
Figure 9 shows the layout of
the 13-segment display, an excerpt from the LCD pinout specification table, and the pinout connections
between the MCU and the LCD glass.
Table 5 shows the corresponding MCU LCD RAM registers. Note
that two adjacent MCD LCD RAM registers, LCDRAM1 and LCDRAM0, are used for the 13-segment
alpha numeric segment group.
B F
A
H J K
G
E N M L C
D