MCP2517FD datasheet(64/98 Pages) MICROCHIP

64 / 98 page

MCP2517FD

DS20005688B-page 64

Draft

 2017-2018 Microchip Technology Inc.

TABLE 3-5:

TRANSMIT MESSAGE OBJECT (TXQ AND TX FIFO)

Word

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

-—

SID11

EID<17:6>

23:16

EID<12:5>

15:8

EID<4:0>

SID<10:8>

7:0

SID<7:0>

31:24

-—

23:16

-—

15:8

SEQ<6:0>

ESI

7:0

FDF

BRS

RTR

IDE

DLC<3:0>

T2 (1)

31:24

Transmit Data Byte 3

23:16

Transmit Data Byte 2

15:8

Transmit Data Byte 1

7:0

Transmit Data Byte 0

31:24

Transmit Data Byte 7

23:16

Transmit Data Byte 6

15:8

Transmit Data Byte 5

7:0

Transmit Data Byte 4

31:24

Transmit Data Byte n

23:16

Transmit Data Byte n-1

15:8

Transmit Data Byte n-2

7:0

Transmit Data Byte n-3

bit T0.31-30 Unimplemented: Read as ‘x’

bit T0.29

SID11:

In FD mode the standard ID can be extended to 12 bit using r1

bit T0.28-11

EID<17:0>:

Extended Identifier

bit T0.10-0

SID<10:0>:

Standard Identifier

bit T1.31-16 Unimplemented: Read as ‘x’

bit T1.15-9

SEQ<6:0>:

Sequence to keep track of transmitted messages in Transmit Event FIFO

bit T1.8

ESI:

Error Status Indicator

In CAN to CAN gateway mode (CiCON.ESIGM=1), the transmitted ESI flag is a “logical OR” of T1.ESI

and error passive state of the CAN controller;

In normal mode ESI indicates the error status

= Transmitting node is error passive

= Transmitting node is error active

bit T1.7

FDF:

FD Frame; distinguishes between CAN and CAN FD formats

bit T1.6

BRS:

Bit Rate Switch; selects if data bit rate is switched

bit T1.5

RTR:

Remote Transmission Request; not used in CAN FD

bit T1.4

IDE:

Identifier Extension Flag; distinguishes between base and extended format

bit T1.3-0

DLC<3:0>:

Data Length Code

Note 1:

Data Bytes 0-n: payload size is configured individually in control register (CiFIFOCONm.PLSIZE<2:0>).

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