MCP2515-E/PRB2 Microchip Technology, MCP2515-E/PRB2 Datasheet - Page 67

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

FIGURE 12-8:
FIGURE 12-9:
© 2007 Microchip Technology Inc.
CANINTF.RXnIF bits are mapped to
bits 7 and 6.
* Buffer 0 has higher priority, therefore, RXB0 status is
0
0
1
1
7
reflected in bits 4:0.
SCK
SCK
CS
SO
CS
SO
SI
SI
6
0 No RX message
1 Message in RXB0
0 Message in RXB1
1 Messages in both buffers*
1
1
Received Message
0
0
high-impedance
high-impedance
0
0
1
1
1
1
2
instruction
2
instruction
READ STATUS INSTRUCTION
RX STATUS INSTRUCTION
1
0
3
3
0
0
4
4
0
0
5
5
0
0
6
6
The extended ID bit is mapped to
bit 4. The RTR bit is mapped to
bit 3.
0
0
7
0 0 Standard data frame
0 1 Standard remote frame
1 0 Extended data frame
1 1 Extended remote frame
4
7
7
7
3
8
8
6
6
9 10 11 12 13 14 15 16 17 18 19 20 21 22
9 10 11 12 13 14 15 16 17 18 19 20 21 22
Msg Type Received
5
5
data out
data out
4
4
3
3
2
2
1
1
don’t care
don’t care
0
0
7
7
0 0 0 RXF0
0 0 1 RXF1
0 1 0 RXF2
0 1 1 RXF3
1 0 0 RXF4
1 0 1 RXF5
1 1 0 RXF0 (rollover to RXB1)
1 1 1 RXF1 (rollover to RXB1)
2
CANINTF.RX0IF
CANINTFL.RX1IF
TXB0CNTRL.TXREQ
CANINTF.TX0IF
TXB1CNTRL.TXREQ
CANINTF.TX1IF
TXB2CNTRL.TXREQ
CANINTF.TX2IF
6
6
1 0
5
5
4
data out
4
data out
repeat
repeat
3
MCP2515
3
Filter Match
2
2
DS21801E-page 67
1
1
0
0
23
23