Datasheet
2003-2013 Microchip Technology Inc. DS39612C-page 13
PIC18F6525/6621/8525/8621
PORTB is a bidirectional I/O port. PORTB
can be software programmed for internal
weak pull-ups on all inputs.
RB0/INT0/FLT0
RB0
INT0
FLT0
48 58
I/O
I
I
TTL
ST
ST
Digital I/O.
External interrupt 0.
PWM Fault input for ECCP1.
RB1/INT1
RB1
INT1
47 57
I/O
I
TTL
ST
Digital I/O.
External interrupt 1.
RB2/INT2
RB2
INT2
46 56
I/O
I
TTL
ST
Digital I/O.
External interrupt 2.
RB3/INT3/ECCP2/P2A
RB3
INT3
ECCP2
(1)
P2A
(1)
45 55
I/O
I/O
I/O
O
TTL
ST
ST
—
Digital I/O.
External interrupt 3.
Enhanced Capture 2 input, Compare 2
output, PWM2 output.
ECCP2 output P2A.
RB4/KBI0
RB4
KBI0
44 54
I/O
I
TTL
ST
Digital I/O.
Interrupt-on-change pin.
RB5/KBI1/PGM
RB5
KBI1
PGM
43 53
I/O
I
I/O
TTL
ST
ST
Digital I/O.
Interrupt-on-change pin.
Low-Voltage ICSP™ programming
enable pin.
RB6/KBI2/PGC
RB6
KBI2
PGC
42 52
I/O
I
I/O
TTL
ST
ST
Digital I/O.
Interrupt-on-change pin.
In-Circuit Debugger and
ICSP programming clock.
RB7/KBI3/PGD
RB7
KBI3
PGD
37 47
I/O
I
I/O
TTL
ST
ST
Digital I/O.
Interrupt-on-change pin.
In-Circuit Debugger and
ICSP programming data.
TABLE 1-2: PIC18F6525/6621/8525/8621 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
PIC18F6X2X PIC18F8X2X
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I = Input O = Output
P = Power OD = Open-Drain (no P diode to V
DD)
Note 1: Alternate assignment for ECCP2/P2A in PIC18F8525/8621 devices when CCP2MX (CONFIG3H<0>) is not set (all
Program Memory modes except Microcontroller).
2: Default assignment for ECCP2/P2A when CCP2MX is set (all devices).
3: External memory interface functions are only available on PIC18F8525/8621 devices.
4: Default assignment for P1B/P1C/P3B/P3C for PIC18F8525/8621 devices when ECCPMX (CONFIG3H<1>) is set and for
all PIC18F6525/6621 devices.
5: Alternate assignment for ECCP2/P2A in PIC18F8525/8621 devices when CCP2MX is not set (Microcontroller mode).
6: PORTH and PORTJ (and their multiplexed functions) are only available on PIC18F8525/8621 devices.
7: Alternate assignment for P1B/P1C/P3B/P3C for PIC18F8525/8621 devices when ECCPMX (CONFIG3H<1>) is not set.
8: AV
DD 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 D001 for details.
9: RG5 is multiplexed with MCLR
and is only available when the MCLR Resets are disabled.