PIC18F23K22-ESLASHML datasheet(146/496 Pages) MICROCHIP

146 / 496 page

PIC18(L)F2X/4XK22

DS41412C-page 146

Preliminary

 2010 Microchip Technology Inc.

10.5

PORTD Registers

PORTD is an 8-bit wide, bidirectional port. The

corresponding data direction register is TRISD. Setting

a TRISD bit (= 1) will make the corresponding PORTD

pin an input (i.e., disable the output driver). Clearing a

TRISD bit (= 0) will make the corresponding PORTD

pin an output (i.e., enable the output driver and put the

contents of the output latch on the selected pin).

The Data Latch register (LATD) is also memory

mapped. Read-modify-write operations on the LATD

PORTD.

All pins on PORTD are implemented with Schmitt

Trigger input buffers. Each pin is individually

configurable as an input or output.

All of the PORTD pins are multiplexed with analog and

digital peripheral modules. See Table .

EXAMPLE 10-4:

INITIALIZING PORTD

10.5.1

PORTD OUTPUT PRIORITY

Each PORTD pin is multiplexed with other functions.

The pins, their combined functions and their output

priorities are briefly described here. For additional

information, refer to the appropriate section in this data

sheet.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the higher priority.

Table 10-4 lists the PORTD pin functions from the

highest to the lowest priority.

Analog input functions, such as ADC, comparator and

SR Latch inputs, are not shown in the priority lists.

These inputs are active when the I/O pin is set for

Analog mode using the ANSELx registers. Digital

output functions may control the pin when it is in Analog

mode with the priority shown below.

Note:

PORTD is only available on 40-pin and 44-

pin devices.

Note:

On a Power-on Reset, these pins are

configured as analog inputs.

MOVLB

0xF

; Set BSR for banked SFRs

CLRF

PORTD

; Initialize PORTD by

; clearing output

; data latches

CLRF

LATD

; Alternate method

; to clear output

; data latches

MOVLW

0CFh

; Value used to

; initialize data

; direction

MOVWF

TRISD

; Set RD<3:0> as inputs

; RD<5:4> as outputs

; RD<7:6> as inputs

MOVLW

30h

; Value used to

; enable digital inputs

MOVWF

ANSELD ; RD<3:0> dig input enable

; RC<7:6> dig input enable

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