PIC18F97J60_11 Datasheet, PDF (164/492 Pages) Microchip Technology – 64/80/100-Pin, High-Performance, 1-Mbit Flash Microcontrollers with Ethernet

PIC18F97J60 FAMILY
11.9 PORTH, LATH and
TRISH Registers
Note: PORTH is available only on 80-pin and
100-pin devices.
PORTH is an 8-bit wide, bidirectional I/O port; it is fully
implemented on 80-pin and 100-pin devices. The
corresponding Data Direction register is TRISH. Set-
ting a TRISH bit (= 1) will make the corresponding
PORTH pin an input (i.e., put the corresponding output
driver in a High-Impedance mode). Clearing a TRISH
bit (= 0) will make the corresponding PORTH pin an
output (i.e., put the contents of the output latch on the
selected pin). PORTH<3:0> pins are digital only and
tolerate voltages up to 5.5V.
The Output Latch register (LATH) is also memory
mapped. Read-modify-write operations on the LATH
register, read and write the latched output value for
PORTH.
All pins on PORTH are implemented with Schmitt
Trigger input buffers. Each pin is individually
configurable as an input or output.
When the external memory interface is enabled, four of
the PORTH pins function as the high-order address
lines for the interface. The address output from the
interface takes priority over other digital I/O. The
corresponding TRISH bits are also overridden.
PORTH pins, RH4 through RH7, are multiplexed with
analog converter inputs. The operation of these pins as
analog inputs is selected by clearing or setting the
PCFG<3:0> control bits in the ADCON1 register.
PORTH can also be configured as the alternate
Enhanced PWM Output Channels B and C for the
ECCP1 and ECCP3 modules. This is done by clearing
the ECCPMX Configuration bit.
EXAMPLE 11-8:
CLRF PORTH
CLRF LATH
MOVLW
MOVWF
MOVLW
0Fh
ADCON1
0CFh
MOVWF TRISH
INITIALIZING PORTH
; Initialize PORTH by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Configure PORTH as
; digital I/O
; Value used to
; initialize data
; direction
; Set RH3:RH0 as inputs
; RH5:RH4 as outputs
; RH7:RH6 as inputs
DS39762F-page 164
 2011 Microchip Technology Inc.