PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 184

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
17.1.2
The PIC18CXX8 has three transmit and two receive
buffers, two acceptance masks (one for each receive
buffer), and a total of six acceptance filters. Figure 17-1
is a block diagram of these buffers and their connection
to the protocol engine.
FIGURE 17-1: CAN BUFFERS AND PROTOCOL ENGINE BLOCK DIAGRAM
DS30475A-page 184
Message
Control
BUFFERS
PROTOCOL
ENGINE
Queue
TXB0
TRANSMIT/RECEIVE BUFFERS
Transmit
Logic
TX
Transmit Byte Sequencer
TXB1
CRC Generator
Transmit Shift
Advanced Information
TXB2
A
c
c
e
p
t
R
X
B
0
Receive Shift
CRC Check
Acceptance Mask
Acceptance Filter
Acceptance Filter
Data Field
Identifier
RXM0
RXF0
RXF1
Timing
Logic
Bit
RX
M
A
B
2000 Microchip Technology Inc.
Transmit
Receive
Counter
Counter
Identifier
Acceptance Mask
Acceptance Filter
Acceptance Filter
Acceptance Filter
Acceptance Filter
Machine
Protocol
Data Field
Error
Error
Finite
State
RXM1
RXF2
RXF3
RXF4
RXF5
Bit Timing
Generator
RXERRCNT
TXERRCNT
BusOff
ErrPas
R
X
B
1
A
c
c
e
p
t