PIC18F6585 Datasheet, PDF (278/496 Pages) Microchip Technology – 64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PIC18F6585/8585/6680/8680
FIGURE 23-1:
CAN BUFFERS AND PROTOCOL ENGINE BLOCK DIAGRAM
BUFFERS
16-4 to 1 muxs
TXB0
Message
Queue
Control
TXB1
TXB2
Acceptance Filters
(RXF0 – RXF05)
A
MODE 0
c
c
e
p
Acceptance Filters RXF15
t
(RXF06 – RXF15)
MODE 1, 2
Transmit Byte Sequencer
Transmit Option
MODE 0
2 RX
Buffers
MODE 1, 2
6 TX/RX
Buffers
Identifier
M
A
Data Field ^B
VCC
Rcv Byte
MESSAGE
BUFFERS
PROTOCOL
ENGINE
Transmit<7:0>
Receive<8:0>
Shift<14:0>
{Transmit<5:0>, Receive<8:0>}
Comparator
CRC<14:0>
Receive
Error
Counter
Transmit
Error
Counter
REC
TEC
Err-Pas
Bus-Off
Protocol
Finite
State
Machine
Transmit
Logic
TX
Bit
Timing
Logic
RX
Clock
Generator
Configuration
Registers
DS30491C-page 276
 2004 Microchip Technology Inc.