MCP2515-E/PRB2 Microchip Technology, MCP2515-E/PRB2 Datasheet - Page 5

• Manufacturer Part Number: MCP2515-E/PRB2
• Description: CAN controller with SPI interface, 125 deg C, -40C to +125C, 18-PDIP, TUBE
• Manufacturer: Microchip Technology

1.4
The MCP2515 has three transmit and two receive
buffers, two acceptance masks (one for each receive
buffer) and a total of six acceptance filters.
shows a block diagram of these buffers and their
connection to the protocol engine.
FIGURE 1-3:
© 2007 Microchip Technology Inc.
Message
Control
Queue
BUFFERS
PROTOCOL
ENGINE
TXB0
Transmit/Receive Buffers/Masks/
Filters
CAN BUFFERS AND PROTOCOL ENGINE BLOCK DIAGRAM
Transmit
Transmit Byte Sequencer
Logic
TX
TXB1
{Transmit<5:0>, Receive<8:0>}
Shift<14:0>
Transmit<7:0>
Figure 1-3
TXB2
Comparator
CRC<14:0>
A
c
c
e
p
t
R
X
B
0
Receive<7:0>
Acceptance Mask
Acceptance Filter
Acceptance Filter
Data Field
Identifier
RXM0
RXF0
RXF1
Timing
Logic
Bit
RX
M
A
B
Acceptance Mask
MCP2515
Acceptance Filter
Acceptance Filter
Acceptance Filter
Acceptance Filter
Identifier
Data Field
Transmit
Machine
Protocol
Receive
Counter
Counter
Configuration
RXM1
RXF2
RXF3
RXF4
RXF5
Finite
State
Error
Error
Generator
Registers
DS21801E-page 5
Clock
SOF
BusOff
ErrPas
REC
TEC
R
X
B
1
A
c
c
e
p
t