Datasheet

© 2009-2012 Microchip Technology Inc. Preliminary DS70616F-page 379
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
21.5 ECAN Message Buffers
ECAN Message Buffers are part of DMA RAM Memory.
They are not ECAN Special Function Registers. The
user application must directly write into the DMA RAM
area that is configured for ECAN Message Buffers. The
location and size of the buffer area is defined by the
user application.
BUFFER 21-1: ECAN™ MESSAGE BUFFER WORD 0
U-0 U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x
— — — SID10 SID9 SID8 SID7 SID6
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
SID5 SID4 SID3 SID2 SID1 SID0 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 TXIDE =
0:
1 = Message will request remote transmission
0 = Normal message
When TXIDE =
1:
The SRR bit must be set to ‘1’
bit 0 IDE: Extended Identifier bit
1 = Message will transmit extended identifier
0 = Message will transmit standard identifier
BUFFER 21-2: ECAN™ MESSAGE BUFFER WORD 1
U-0 U-0 U-0 U-0 R/W-x R/W-x R/W-x R/W-x
— — — —EID17EID16EID15EID14
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
EID13 EID12 EID11 EID10 EID9 EID8 EID7 EID6
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