PIC18F6390 Datasheet, PDF (131/412 Pages) Microchip Technology – 64/80-Pin Flash Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F6390/6490/8390/8490
9.9 PORTJ, TRISJ and
LATJ Registers
Note: PORTJ is available only on 80-pin devices.
PORTJ is an 8-bit wide, bidirectional port. The corre-
sponding data direction register is TRISJ. Setting a
TRISJ bit (= 1) will make the corresponding PORTJ pin
an input (i.e., put the corresponding output driver in a
high-impedance mode). Clearing a TRISJ bit (= 0) will
make the corresponding PORTJ pin an output (i.e., put
the contents of the output latch on the selected pin).
The Data Latch register (LATJ) is also memory
mapped. Read-modify-write operations on the LATJ
register read and write the latched output value for
PORTJ.
All pins on PORTJ 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.
PORTJ is also multiplexed with LCD segment drives
controlled by the LCDSE4 register. I/O port functions
are only available when the segments are disabled.
EXAMPLE 9-9: INITIALIZING PORTJ
CLRF PORTJ
CLRF LATJ
MOVLW 0xCF
MOVWF TRISJ
; Initialize PORTG by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Value used to
; initialize data
; direction
; Set RJ3:RJ0 as inputs
; RJ5:RJ4 as output
; RJ7:RJ6 as inputs
 2004 Microchip Technology Inc.
Preliminary
DS39629B-page 129