Datasheet

PIC16C9XX

DS30444E - page 100  1997 Microchip Technology Inc.

13.4.1 SEGMENT ENABLES

The LCDSE register is used to select the pin function

for groups of pins. The selection allows each group of

pins to operate as either LCD drivers or digital only

pins. To conﬁgure the pins as a digital port, the corre-

sponding bits in the LCDSE register must be cleared.

If the pin is a digital I/O the corresponding TRIS bit con-

trols the data direction. Any bit set in the LCDSE regis-

ter overrides any bit settings in the corresponding TRIS

Note 1: On a Power-on Reset these pins are con-

ﬁgured as LCD drivers.

Note 2: The LMUX1:LMUX0 takes precedence

over the LCDSE bit settings for pins RD7,

RD6 and RD5.

EXAMPLE 13-1: STATIC MUX WITH 32

SEGMENTS

BCF STATUS,RP0 ;Select Bank 2

BSF STATUS,RP1 ;

BCF LCDCON,LMUX1 ;Select Static MUX

BCF LCDCON,LMUX0 ;

MOVLW 0xFF ;Make PortD,E,F,G

MOVWF LCDSE ;LCD pins

. . . ;configure rest of LCD

EXAMPLE 13-2: 1/3 MUX WITH 13

SEGMENTS

BCF STATUS,RP0 ;Select Bank 2

BSF STATUS,RP1 ;

BSF LCDCON,LMUX1 ;Select 1/3 MUX

BCF LCDCON,LMUX0 ;

MOVLW 0x87 ;Make PORTD<7:0> &

MOVWF LCDSE ;PORTE<6:0> LCD pins

. . . ;configure rest of LCD

FIGURE 13-12:LCDSE REGISTER (ADDRESS 10Dh)

R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1

SE29 SE27 SE20 SE16 SE12 SE9 SE5 SE0 R =Readable bit

W =Writable bit

U =Unimplemented bit,

Read as ‘0’

-n =Value at POR reset

bit7 bit0

bit 7: SE29: Pin function select RD7/COM1/SEG31 - RD5/COM3/SEG29