PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 104

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
8.8
PORTH is a 5-bit wide, bi-directional port available only
on the PIC18C858 devices. The corresponding Data
Direction register is TRISH. Setting a TRISH bit (=1)
will make the corresponding PORTH pin an input (i.e.,
put the corresponding output driver in a hi-impedance
mode). Clearing a TRISH bit (=0) will make the corre-
sponding PORTH pin an output (i.e., put the contents
of the output latch on the selected pin).
Read-modify-write operations on the LATH register
read and write the latched output value for PORTH.
Pins RH0-RH3 on the PIC18C858 are bi-directional I/O
pins with ST input buffers. Pins RH4-RH7 on all devices
are multiplexed with A/D converter inputs.
FIGURE 8-16: RH3:RH0 PINS BLOCK
DS30475A-page 104
WR TRISH
WR LATH
or
WR PORTH
Data Bus
Note:
Note:
Note:
PORTH, LATH, and TRISH Registers
I/O pins have diode protection to V
This port is available on PIC18C858.
On a Power-on Reset, the RH7:RH4 pins
are configured as inputs and read as ’0’.
RD
PORTH
TRIS Latch
Data Latch
D
D
CK
CK
RD LATH
RD TRISH
DIAGRAM
Q
Q
Q
Q
Q
EN
D
DD
Schmitt
Trigger
and V
Advanced Information
V
V
N
P
SS
DD
SS
.
I/O Pin
EXAMPLE 8-8:
FIGURE 8-17: RH7:RH4 PINS BLOCK
CLRF
CLRF
MOVLW
MOVWF
MOVLW
MOVWF
WR TRISH
WR LATH
or
WR PORTH
Note:
Data
Bus
RD PORTH
To A/D Converter
PORTH
LATH
0x0F
ADCON1
0xCF
TRISH
I/O pins have diode protection to V
D
D
Data Latch
TRIS Latch
CK
CK
DIAGRAM
INITIALIZING PORTH
RD LATH
; Initialize PORTH by
; Alternate method
;
;
; RH5:RH4 as outputs
; RH7:RH6 as inputs
; clearing output
; data latches
; to clear output
; data latches
; Value used to
; initialize data
; direction
; Set RH3:RH0 as inputs
RD TRISH
Q
Q
Q
Q
 2000 Microchip Technology Inc.
Q
Analog
Input
Mode
EN
D
DD
V
V
P
N
DD
SS
and V
SS
I/O Pin
ST
Input
Buffer
.