2010-2013 Microchip Technology Inc. DS30009740B-page 21
Liquid Crystal Display (LCD)
6.0 LCD MULTIPLEX TYPES
The LCD driver module can be configured into four Multiplex types:
• Static (only COM0 used)
• 1/2 Multiplex (COM0 and COM1 are used)
• 1/3 Multiplex (COM0, COM1 and COM2 are used)
• 1/4 Multiplex (COM0, COM1, COM2 and COM3 are used)
• 1/5 Multiplex (COM0, COM1, COM2, COM3 and COM4 are used)
• 1/6 Multiplex (COM0, COM1, COM2, COM3, COM4 and COM5 are used)
• 1/7 Multiplex (COM0, COM1, COM2, COM3, COM4, COM5 and COM6 are used)
• 1/8 Multiplex (COM0, COM1, COM2, COM3, COM4, COM5, COM6 and COM7 are used)
The LMUX<2:0> bits setting (LCDCON<2:0>) decides the function of the COM pins. (For details,
see Tab l e 6-1.)
If the pin is a digital I/O, the corresponding TRIS bit controls the data direction. If the pin is a COM
drive, the TRIS setting of that pin is overridden.
Note: On a Power-on Reset, the LMUX<2:0> bits are ‘000’.
Table 6-1: COM<7:0> Pin Function
LMUX<2:0> COM7 Pin COM6 Pin COM5 Pin COM4 Pin COM3 Pin COM2 Pin COM1 Pin COM0 Pin
111 COM7 COM6 COM5 COM4 COM3 COM2 COM1 COM0
110 I/O Pin COM6 COM5 COM4 COM3 COM2 COM1 COM0
101 I/O Pin I/O Pin COM5 COM4 COM3 COM2 COM1 COM0
100 I/O Pin I/O Pin I/O Pin COM4 COM3 COM2 COM1 COM0
011 I/O Pin I/O Pin I/O Pin I/O Pin COM3 COM2 COM1 COM0
010 I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin COM2 COM1 COM0
001 I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin COM1 COM0
000 I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin I/O Pin COM0
Note: Pins, COM<7:4>, can also be used as SEG pins when 1/4 Multiplex to Static Multiplex are used. These
pins can be used as I/O pins only if the respective bits in the LCDSEx registers are set to ‘0’.
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