PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 91

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

10.9
PORTJ is an 8-bit wide, bi-directional port. The corre-
sponding data direction register is DDRJ. A ’1’ in DDRJ
configures the corresponding port pin as an input. A ’0’
in the DDRJ register configures the corresponding port
pin as an output. Reading PORTJ reads the status of
the pins, whereas writing to PORTJ will write to the
respective port latch.
PORTJ is a general purpose I/O port.
FIGURE 10-19:
2000 Microchip Technology Inc.
Note: I/O pins have protection diodes to V
PORTJ and DDRJ Registers
(PIC17C76X only)
V
N
P
PORTJ BLOCK DIAGRAM
DD
D
EN
EN
DD
and V
Q
Q
Q
Q
SS
.
CK
CK
D
D
EXAMPLE 10-9:
MOVLB
CLRF
MOVLW
MOVWF
8
PORTJ, F
0xCF
DDRJ
; Select Bank 8
; Initialize PORTJ data
; latches before setting
; the data direction
; register
; Value used to initialize
; data direction
; Set RJ<3:0> as inputs
; RJ<5:4> as outputs
; RJ<7:6> as inputs
INITIALIZING PORTJ
PIC17C7XX
WR_PORTJ
RD_PORTJ
WR_DDRJ
RD_DDRJ
Data Bus
DS30289B-page 91