
2002 Microchip Technology Inc.
Preliminary
DS30485A-page 17
PIC18FXX39
PORTD is a bi-directional I/O port, or a Parallel Slave
Port (PSP) for interfacing to a microprocessor port.
These pins have TTL input buffers when PSP module
is enabled.
RD0/PSP0
RD0
PSP0
19
38
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD1/PSP1
RD1
PSP1
20
39
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD2/PSP2
RD2
PSP2
21
40
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD3/PSP3
RD3
PSP3
22
41
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD4/PSP4
RD4
PSP4
27
2
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD5/PSP5
RD5
PSP5
28
3
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD6/PSP6
RD6
PSP6
29
4
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
RD7/PSP7
RD7
PSP7
30
5
I/O
ST
TTL
Digital I/O.
Parallel Slave Port Data.
TABLE 1-3:
PIC18F4X39 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
DIP
QFN TQFP
Legend: TTL = TTL compatible input
CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels
I
= Input
O= Output
P
= Power
OD = Open Drain (no P diode to VDD)