Datasheet

PIC18F66K80 FAMILY
DS39977F-page 184  2010-2012 Microchip Technology Inc.
11.5 PORTD, TRISD and
LATD Registers
PORTD is an 8-bit wide, bidirectional port. The
corresponding Data Direction and Output Latch registers
are TRISD and LATD.
All pins on PORTD are implemented with Schmitt
Trigger input buffers. Each pin is individually
configurable as an input or output.
Each of the PORTD pins has a weak internal pull-up. A
single control bit can turn off all the pull-ups. This is
performed by setting bit, RDPU (PADCFG1<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are
disabled on all device Resets.
PORTD can also be configured as an 8-bit wide micro-
processor port (Parallel Slave Port) by setting control
bit, PSPMODE (PSPCON<4>). In this mode, the input
buffers are ST. For additional information, see
Section 11.9 “Parallel Slave Port”.
RD3 has a CTMU functionality.
EXAMPLE 11-4: INITIALIZING PORTD
Note: PORTD is unavailable on 28-pin devices.
Note: These pins are configured as digital inputs
on any device Reset.
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