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PIC18FXX20 Datasheet, PDF (22/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D
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PIC18FXX20
TABLE 1-2: PIC18FXX20 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
PIC18F6X20 PIC18F8X20 Type
Buffer
Type
Description
PORTJ is a bi-directional I/O port(5).
RJ0/ALE
RJ0
ALE
—
62
I/O
ST
Digital I/O.
O
TTL
External memory Address Latch Enable.
RJ1/OE
RJ1
OE
—
61
I/O
ST
Digital I/O.
O
TTL
External memory Output Enable.
RJ2/WRL
RJ2
WRL
—
60
I/O
ST
Digital I/O.
O
TTL
External memory Write Low control.
RJ3/WRH
RJ3
WRH
—
59
I/O
ST
Digital I/O.
O
TTL
External memory Write High control.
RJ4/BA0
RJ4
BA0
—
39
I/O
ST
Digital I/O.
O
TTL
External memory Byte Address 0 control.
RJ5/CE
RJ5
CE
—
40
I/O
ST
Digital I/O.
O
TTL
External memory Chip Enable control.
RJ6/LB
RJ6
LB
—
41
I/O
ST
Digital I/O.
O
TTL
External memory Low Byte select.
RJ7/UB
RJ7
UB
—
42
I/O
ST
Digital I/O.
O
TTL
External memory High Byte select.
VSS
9, 25,
11, 31,
P
—
Ground reference for logic and I/O pins.
41, 56
51, 70
VDD
10, 26,
12, 32,
P
—
Positive supply for logic and I/O pins.
38, 57
48, 71
AVSS(6)
20
26
P
—
Ground reference for analog modules.
AVDD(6)
19
25
P
—
Positive supply for analog modules.
Legend: TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
I = Input
P = Power
CMOS = CMOS compatible input or output
Analog = Analog input
O
= Output
OD = Open Drain (no P diode to VDD)
Note 1: Alternate assignment for CCP2 when CCP2MX is not selected (all Operating modes except
Microcontroller).
2: Default assignment when CCP2MX is set.
3: External memory interface functions are only available on PIC18F8X20 devices.
4: CCP2 is multiplexed with this pin by default when configured in Microcontroller mode. Otherwise, it is
multiplexed with either RB3 or RC1.
5: PORTH and PORTJ are only available on PIC18F8X20 (80-pin) devices.
6: AVDD must be connected to a positive supply and AVSS must be connected to a ground reference for proper
operation of the part in User or ICSP modes. See parameter D001A for details.
DS39609A-page 20
Advance Information
 2003 Microchip Technology Inc.
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