PIC18FXX8 Datasheet, PDF (100/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
FIGURE 9-6:
RB2/CANTX/INT2 PIN BLOCK DIAGRAM
OPMODE2:OPMODE0 = 000
ENDRHI
CANTX
RD LATB
Data Bus
WR PORTB or
WR LATB
0
Data Latch
1
DQ
CK Q
TRIS Latch
DQ
WR TRISB
CK Q
RD TRISB
RD PORTB
Note 1: I/O pin has diode protection to VDD and VSS.
Q
D
EN
VDD
P
RB2/CANTX/
INT2 pin⁽¹⁾
N
VSS
Schmitt
Trigger
FIGURE 9-7:
RB3/CANRX PIN BLOCK DIAGRAM
CANCON<7:5>
RBPU⁽²⁾
Data Bus
Data Latch
DQ
WR LATB or PORTB
WR TRISB
CK
TRIS Latch
DQ
CK
VDD
P
Weak
Pull-up
I/O pin⁽¹⁾
RD TRISB
TTL
Input
Buffer
RD LATB
QD
EN
RD PORTB
RB3 or CANRX
Schmitt Trigger
Buffer
Note 1: I/O pins have diode protection to VDD and VSS.
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit (INTCON2<7>).
.
DS41159D-page 98
 2004 Microchip Technology Inc.