PIC18F2525ESOSQTP datasheet(102/412 Pages) MICROCHIP

102 / 412 page

PIC18F2525/2620/4525/4620

DS39626E-page 100

9.4

PORTD, TRISD and LATD

Registers

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

corresponding Data Direction register is TRISD. Set-

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

PORTD pin an input (i.e., put the corresponding output

driver in a high-impedance mode). Clearing a TRISD

bit (= 0) will make the corresponding PORTD pin an

output (i.e., 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.

Three of the PORTD pins are multiplexed with outputs

P1B, P1C and P1D of the Enhanced CCP module. The

operation of these additional PWM output pins is

covered in greater detail in Section 16.0 “Enhanced

Capture/Compare/PWM (ECCP) Module”.

PORTD can also be configured as an 8-bit wide micro-

processor port (Parallel Slave Port) by setting control

bit, PSPMODE (TRISE<4>). In this mode, the input

buffers are TTL. See Section 9.6 “Parallel Slave

Port” for additional information on the Parallel Slave

Port (PSP).

EXAMPLE 9-4:

INITIALIZING PORTD

Note:

PORTD is only available on 40/44-pin

devices.

Note:

On a Power-on Reset, these pins are

configured as digital inputs.

Note:

When the Enhanced PWM mode is used

with either dual or quad outputs, the PSP

functions of PORTD are automatically

disabled.

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

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