PIC18F2450 Datasheet, PDF (109/320 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

9.4 PORTD, TRISD and LATD
Registers
Note: PORTD is only available on 40/44-pin
devices.
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., 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
register read and write the latched output value for
PORTD.
All pins on PORTD are implemented with Schmitt
Trigger input buffers. Each pin is individually
configurable as an input or output.
Note: On a Power-on Reset, these pins are
configured as digital inputs.
PIC18F2450/4450
EXAMPLE 9-4: INITIALIZING PORTD
CLRF
CLRF
MOVLW
MOVWF
PORTD
LATD
0CFh
TRISD
; Initialize PORTD by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Value used to
; initialize data
; direction
; Set RD<3:0> as inputs
; RD<5:4> as outputs
; RD<7:6> as inputs
© 2006 Microchip Technology Inc.
Advance Information
DS39760A-page 107