
PIC18F2423/2523/4423/4523
DS39755C-page 22
2009 Microchip Technology Inc.
PORTD is a bidirectional I/O port or a Parallel Slave
Port (PSP) for interfacing to a microprocessor port.
These pins have TTL input buffers when the 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/P1B
RD5
PSP5
P1B
28
3
I/O
O
ST
TTL
—
Digital I/O.
Parallel Slave Port data.
Enhanced CCP1 output.
RD6/PSP6/P1C
RD6
PSP6
P1C
29
4
I/O
O
ST
TTL
—
Digital I/O.
Parallel Slave Port data.
Enhanced CCP1 output.
RD7/PSP7/P1D
RD7
PSP7
P1D
30
5
I/O
O
ST
TTL
—
Digital I/O.
Parallel Slave Port data.
Enhanced CCP1 output.
TABLE 1-3:
PIC18F4423/4523 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
PDIP
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
I2C= I2C/SMBus
Note 1: Default assignment for CCP2 when Configuration bit, CCP2MX, is set.
2: Alternate assignment for CCP2 when Configuration bit, CCP2MX, is cleared.