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70353C Datasheet(PDF) 29 Page - Microchip Technology

Part # 70353C
Description  Section 21. Enhanced Controller Area Network
PDF  76 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

70353C Datasheet(HTML) 29 Page - Microchip Technology

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© 2008-2011 Microchip Technology Inc.
DS70353C-page 21-29
Section 21. Enhanced Controller Area Network (ECAN™)
21
21.4
ECAN MESSAGE BUFFERS
ECAN message buffers are located in device RAM. They are not ECAN SFRs. The user
application must directly write into the device RAM area that is configured for ECAN message
buffers. The location and size of the buffer area is defined by the user application.
This section provides information on how the message buffer words are organized for
transmission and reception. (See also 21.2 “CAN Message Formats” for message buffer layout
details and 21.8 “DMA Controller Configuration” for details on how to configure ECAN
message buffers in device RAM).
Buffer 21-1:
ECAN Message Buffer Word 0
U-x
U-x
U-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
—
—
—
SID<10:6>
bit 15
bit 8
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
SID<5:0>
SRR
IDE
bit 7
bit 0
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
bit 15-13
Unimplemented: Read as ‘0’
bit 12-2
SID<10:0>: Standard Identifier bits
bit 1
SRR: Substitute Remote Request bit
When IDE = 0:
1 = In case of Transmission, this will cause a Remote Frame to be transmitted. In case of Received
message, indicates a remote frame was received.
0 = Normal message
When IDE = 1:
The SRR bit must be set to ‘1’
bit 0
IDE: Extended Identifier bit
1 = Message will transmit extended identifier or received message has an extended identifier
0 = Message will transmit standard identifier or received message has a standard identifier
Buffer 21-2:
ECAN Message Buffer Word 1
U-x
U-x
U-x
U-x
R/W-x
R/W-x
R/W-x
R/W-x
—
—
—
—
EID<17:14>
bit 15
bit 8
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID<13:6>
bit 7
bit 0
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
bit 15-12
Unimplemented: Read as ‘0’
bit 11-0
EID<17:6>: Extended Identifier bits



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