Microchip Technology DV164136 Data Sheet
© 2008 Microchip Technology Inc.
DS39646C-page 157
PIC18F8722 FAMILY
TABLE 11-17: PORTJ FUNCTIONS
TABLE 11-18: SUMMARY OF REGISTERS ASSOCIATED WITH PORTJ
Pin Name
Function
TRIS
Setting
I/O
I/O
Type
Description
RJ0/ALE
RJ0
0
O
DIG
LATJ<0> data output.
1
I
ST
PORTJ<0> data input.
ALE
x
O
DIG
External memory interface address latch enable control output. Takes
priority over digital I/O.
priority over digital I/O.
RJ1/OE
RJ1
0
O
DIG
LATJ<1> data output.
1
I
ST
PORTJ<1> data input.
OE
x
O
DIG
External memory interface output enable control output. Takes priority
over digital I/O.
over digital I/O.
RJ2/WRL
RJ2
0
O
DIG
LATJ<2> data output.
1
I
ST
PORTJ<2> data input.
WRL
x
O
DIG
External Memory Bus write low byte control. Takes priority over
digital I/O.
digital I/O.
RJ3/WRH
RJ3
0
O
DIG
LATJ<3> data output.
1
I
ST
PORTJ<3> data input.
WRH
x
O
DIG
External memory interface write high byte control output. Takes priority
over digital I/O.
over digital I/O.
RJ4/BA0
RJ4
0
O
DIG
LATJ<4> data output.
1
I
ST
PORTJ<4> data input.
BA0
x
O
DIG
External memory interface byte address 0 control output. Takes
priority over digital I/O.
priority over digital I/O.
RJ5/CE
RJ5
0
O
DIG
LATJ<5> data output.
1
I
ST
PORTJ<5> data input.
CE
x
O
DIG
External memory interface chip enable control output. Takes priority
over digital I/O.
over digital I/O.
RJ6/LB
RJ6
0
O
DIG
LATJ<6> data output.
1
I
ST
PORTJ<6> data input.
LB
x
O
DIG
External memory interface lower byte enable control output. Takes
priority over digital I/O.
priority over digital I/O.
RJ7/UB
RJ7
0
O
DIG
LATJ<7> data output.
1
I
ST
PORTJ<7> data input.
UB
x
O
DIG
External memory interface upper byte enable control output. Takes
priority over digital I/O.
priority over digital I/O.
Legend:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input,
TTL = TTL Buffer Input, x = Don’t care (TRIS bit does not affect port direction or is overridden for this option).
TTL = TTL Buffer Input, x = Don’t care (TRIS bit does not affect port direction or is overridden for this option).
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on page
PORTJ
RJ7
RJ6
RJ5
RJ4
RJ3
RJ2
RJ1
RJ0
LATJ
LATJ7
LATJ6
LATJ5
LATJ4
LATJ3
LATJ2
LATJ1
LATJ0
TRISJ
TRISJ7
TRISJ6
TRISJ5
TRISJ4
TRISJ3
TRISJ2
TRISJ1
TRISJ0