Data Sheet
Table Of Contents
- 1.0 Device Overview
- 2.0 Can Message Frames
- 3.0 Message Transmission
- 4.0 Message Reception
- 5.0 Bit Timing
- 6.0 Error Detection
- 7.0 Interrupts
- 8.0 Oscillator
- 9.0 RESET
- 10.0 Modes of Operation
- 11.0 Register Map
- 12.0 SPI™ Interface
- 12.1 Overview
- 12.2 Reset Instruction
- 12.3 Read Instruction
- 12.4 Read RX Buffer Instruction
- 12.5 Write Instruction
- 12.6 Load TX Buffer Instruction
- 12.7 Request-To-Send (RTS) Instruction
- 12.8 Read Status Instruction
- 12.9 RX Status Instruction
- 12.10 Bit Modify Instruction
- Figure 12-1: Bit Modify
- Table 12-1: SPI™ Instruction Set
- Figure 12-2: Read instruction
- Figure 12-3: Read RX Buffer Instruction
- Figure 12-4: Byte Write instruction
- Figure 12-5: Load TX Buffer
- Figure 12-6: Request-to-send (RTS) instruction
- Figure 12-7: BIT Modify instruction
- Figure 12-8: Read Status instruction
- Figure 12-9: RX StatUs Instruction
- Figure 12-10: SPI™ Input Timing
- Figure 12-11: SPI™ Output TIming
- 13.0 Electrical Characteristics
- 14.0 PackAging Information
MCP2515
DS21801D-page 30 Preliminary © 2005 Microchip Technology Inc.
REGISTER 4-5: RXBnSIDL – RECEIVE BUFFER n STANDARD IDENTIFIER LOW
(ADDRESS: 62h, 72h)
REGISTER 4-6: RXBnEID8 – RECEIVE BUFFER n EXTENDED IDENTIFIER HIGH
(ADDRESS: 63h, 73h)
R-x R-x R-x R-x R-x U-0 R-x R-x
SID2 SID1 SID0 SRR IDE —EID17EID16
bit 7 bit 0
bit 7-5 SID: Standard Identifier bits <2:0>
These bits contain the three least significant bits of the Standard Identifier for the received
message
bit 4 SRR: Standard Frame Remote Transmit Request bit (valid only if IDE bit = ‘0’)
1 = Standard Frame Remote Transmit Request Received
0 = Standard Data Frame Received
bit 3 IDE: Extended Identifier Flag bit
This bit indicates whether the received message was a Standard or an Extended Frame
1 = Received message was an Extended Frame
0 = Received message was a Standard Frame
bit 2 Unimplemented: Reads as ‘0’
bit 1-0 EID: Extended Identifier bits <17:16>
These bits contain the two most significant bits of the Extended Identifier for the received
message
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
R-x R-x R-x R-x R-x R-x R-x R-x
EID15 EID14 EID13 EID12 EID11 EID10 EID9 EID8
bit 7 bit 0
bit 7-0 EID: Extended Identifier bits <15:8>
These bits hold bits 15 through 8 of the Extended Identifier for the received message
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown