PIC18F2420/2520/4420/4520
TABLE 10-7: PORTD I/O SUMMARY
TRIS
Setting
I/O
Pin
Function
I/O
Description
Type
RD0/PSP0
RD0
0
1
x
x
0
1
x
x
0
1
x
x
0
1
x
x
0
1
x
x
0
1
x
x
0
O
I
DIG
ST
LATD<0> data output.
PORTD<0> data input.
PSP0
RD1
O
I
DIG
TTL
DIG
ST
PSP read data output (LATD<0>); takes priority over port data.
PSP write data input.
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5/P1B
O
I
LATD<1> data output.
PORTD<1> data input.
PSP1
RD2
O
I
DIG
TTL
DIG
ST
PSP read data output (LATD<1>); takes priority over port data.
PSP write data input.
O
I
LATD<2> data output.
PORTD<2> data input.
PSP2
RD3
O
I
DIG
TTL
DIG
ST
PSP read data output (LATD<2>); takes priority over port data.
PSP write data input.
O
I
LATD<3> data output.
PORTD<3> data input.
PSP3
RD4
O
I
DIG
TTL
DIG
ST
PSP read data output (LATD<3>); takes priority over port data.
PSP write data input.
O
I
LATD<4> data output.
PORTD<4> data input.
PSP4
RD5
O
I
DIG
TTL
DIG
ST
PSP read data output (LATD<4>); takes priority over port data.
PSP write data input.
O
I
LATD<5> data output.
PORTD<5> data input.
PSP5
P1B
O
I
DIG
TTL
DIG
PSP read data output (LATD<5>); takes priority over port data.
PSP write data input.
O
ECCP1 Enhanced PWM output, channel B; takes priority over port and
PSP data. May be configured for tri-state during Enhanced PWM
shutdown events.
RD6/PSP6/P1C
RD6
PSP6
P1C
0
1
x
x
0
O
I
DIG
ST
LATD<6> data output.
PORTD<6> data input.
O
I
DIG
TTL
DIG
PSP read data output (LATD<6>); takes priority over port data.
PSP write data input.
O
ECCP1 Enhanced PWM output, channel C; takes priority over port and
PSP data. May be configured for tri-state during Enhanced PWM
shutdown events.
RD7/PSP7/P1D
RD7
PSP7
P1D
0
1
x
x
0
O
I
DIG
ST
LATD<7> data output.
PORTD<7> data input.
O
I
DIG
TTL
DIG
PSP read data output (LATD<7>); takes priority over port data.
PSP write data input.
O
ECCP1 Enhanced PWM output, channel D; takes priority over port and
PSP data. May be configured for tri-state during Enhanced PWM
shutdown events.
Legend:
DIG = Digital level output; TTL = TTL input buffer; ST = Schmitt Trigger input buffer; x= Don’t care
(TRIS bit does not affect port direction or is overridden for this option).
© 2008 Microchip Technology Inc.
DS39631E-page 115
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