PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 98

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
FIGURE 9-6:
FIGURE 9-7:
DS41159B-page 96
Note 1: I/O pins have diode protection to V
OPMODE2:OPMODE0 = 000
RD LATB
RD TRISB
ENDRHI
CANTX
Data Bus
WR PORTB or
WR LATB
WR TRISB
RD PORTB
Note 1: I/O pin has diode protection to V
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit (INTCON2<7>).
RB2/CANTX BLOCK DIAGRAM
BLOCK DIAGRAM OF RB3/CANRX PIN
CANCON<7:5>
RBPU
Data Bus
WR LATB or PORTB
WR TRISB
RD TRISB
RD LATB
RD PORTB
RB3 or CANRX
(2)
TRIS Latch
Data Latch
D
D
CK
.
CK
Q
Q
Q
Q
DD
DD
and V
Schmitt Trigger
Buffer
and V
Preliminary
SS
0
1
TRIS Latch
Data Latch
SS
D
D
.
CK
CK
.
Q
Q
Q
Q
EN
D
TTL
Input
Buffer
EN
D
V
P
DD
Weak
Pull-up
 2002 Microchip Technology Inc.
pin
I/O
(1)
V
V
P
N
DD
SS
Schmitt
Trigger
RB2 pin
(1)