DocID018789 Rev 4
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UM1079
Hardware and layout
37
4.9
LCD (24 segments, 4 commons)
This LCD allows the STM32L152RCT6 to display any information on six 14-segment digits
and 4 bars, using all COMs. (See the LCD segment mapping in
Figure 17
and pin
connections in
Table 7
.)
Note:
This LCD also supports six 8-segment digits by only using COM0 and COM1.
This configuration allows COM2 and COM3 to be used as I/O ports. In this case the 2 LCD
pins must not be plugged into the LCD socket. To proceed with this configuration, remove
the LCD carefully, slightly open the COM2 and COM3 pins (pin 13 and pin 14) of the LCD,
then replug it in the socket.
Characteristics overview:
•
24 segments and 4 commons
•
Drive method: multiplexed 1/4 duty, 1/3 bias
•
Operating voltage: 3 V
•
Operating temperature: 0 to 50°C
•
Connector: 28-pin DIL 2.54 mm pitch
Note:
When the LCD is plugged, all I/O ports listed in
Table 7
are unavailable. To use one of these
as I/O, you must remove the LCD.
Figure 12. LCD segment mapping
