MCP2515
REGISTER 3-7:
TXBnDLC - TRANSMIT BUFFER n DATA LENGTH CODE
(ADDRESS: 35h, 45h, 55h)
R/W-x
—
R/W-x
RTR
R/W-x
—
R/W-x
—
R/W-x
DLC3
R/W-x
DLC2
R/W-x
DLC1
R/W-x
DLC0
bit 7
bit 0
bit 7
bit 6
Unimplemented: Reads as ‘0’
RTR: Remote Transmission Request bit
1= Transmitted Message will be a Remote Transmit Request
0= Transmitted Message will be a Data Frame
bit 5-4
bit 3-0
Unimplemented: Reads as ‘0’
DLC: Data Length Code <3:0> bits
Sets the number of data bytes to be transmitted (0 to 8 bytes)
Note: It is possible to set the DLC to a value greater than 8, however only 8 bytes are
transmitted
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
‘1’ = Bit is set
REGISTER 3-8:
TXBnDm – TRANSMIT BUFFER n DATA BYTE m
(ADDRESS: 36h - 3Dh, 46h - 4Dh, 56h - 5Dh)
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
TXBnDm TXBnDm TXBnDm TXBnDm TXBnDm TXBnDm TXBnDm TXBnDm
7
6
5
4
3
2
1
0
bit 7
bit 0
bit 7-0
TXBnDM7:TXBnDM0: Transmit Buffer n Data Field Bytes m
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
‘1’ = Bit is set
© 2005 Microchip Technology Inc.
Preliminary
DS21801D-page 21
MICROCHIP [ MICROCHIP ]
