PIC16C925-SSLASHCL datasheet(36/182 Pages) MICROCHIP

36 / 182 page

PIC16C925/926

DS39544A-page 34

Preliminary

 2001 Microchip Technology Inc.

4.4

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

common drivers.

TRISD controls the direction of pins RD0 through RD4

when PORTD is configured as a digital port.

EXAMPLE 4-4:

INITIALIZING PORTD

FIGURE 4-6:

PORTD <4:0> BLOCK

DIAGRAM

FIGURE 4-7:

PORTD<7:5> BLOCK

DIAGRAM

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

configured as LCD segment drivers.

2: To configure the pins as a digital port, the

corresponding bits in the LCDSE register

must be cleared. Any bit set in the LCDSE

corresponding TRIS register.

BCF

STATUS,RP0

;Select Bank2

BSF

STATUS,RP1

;

BCF

LCDSE, SE29

;Make RD<7:5> digital

BCF

LCDSE, SE0

;Make RD<4:0> digital

BSF

STATUS,RP0

;Select Bank1

BCF

STATUS,RP1

;

MOVLW 0xE0

;Make RD<4:0> outputs

MOVWF TRISD

;Make RD<7:5> inputs

Data

Data Latch

TRIS Latch

Schmitt

Trigger

Input

Buffer

I/O pin

LCD

LCD Segment

Segment Data

Output Enable

Port

TRIS

Port

TRIS

SE<n>

Bus

RD Port

Schmitt

Trigger

Input

Buffer

Digital Input/

LCDSE<n>

LCD

LCD Segment

LCD Output pin

LCD

LCD Common

Data Bus

RD TRIS

VDD

Segment Data

Output Enable

Common Data

Output Enable

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