PIC16LC924-08/CL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC924-08/CL

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

5.4 PORTD and TRISD Registers

PORTD is an 8-bit port with Schmitt Trigger input buff-

ers. The first five pins are configurable as general pur-

pose I/O pins or LCD segment drivers. Pins RD5, RD6

and RD7 can be digital inputs or LCD segment or com-

mon drivers.

TRISD controls the direction of pins RD0 through RD4

when PORTD is configured as a digital port.

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

figured as LCD segment drivers.

Note:

To configure the pins as a digital port, the

corresponding bits in the LCDSE register

must be cleared. Any bit set in the LCDSE

register overrides any bit settings in the

corresponding TRIS register.

EXAMPLE 5-4: INITIALIZING PORTD

BCF STATUS,RP0

BSF STATUS,RP1

BCF LCDSE,SE29

BCF LCDSE,SE0

BSF STATUS,RP0

BCF STATUS,RP1

MOVLW 0x07

MOVWF TRISD

;Select Bank2

;

;Make RD<7:5> digital

;Make RD<4:0> digital

;Select Bank1

;

;Make RD<4:0> outputs

;Make RD<7:5> inputs

FIGURE 5-6: PORTD<4:0> BLOCK

DIAGRAM

LCD

Segment Data

LCD Segment

Output Enable

Data Bus

WR

PORT

D

Q

CK

Data Latch

WR

TRIS

D

Q

CK

TRIS Latch

RD TRIS

LCDSE<n>

I/O pin

Schmitt

Trigger

input

buffer

RD

PORT

Q

D

ENEN

DS30444E - page 36

© 1997 Microchip Technology Inc.

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