MCP2518FD datasheet(27/96 Pages) MICROCHIP

27 / 96 page

 2019 Microchip Technology Inc.

DS20006027A-page 27

MCP2518FD

bit 23-21

OPMOD<2:0>: Operation Mode Status bits

000 = Module is in Normal CAN FD mode; supports mixing of CAN FD and Classic CAN 2.0 frames

001 = Module is in Sleep mode

010 = Module is in Internal Loopback mode

011 = Module is in Listen Only mode

100 = Module is in Configuration mode

101 = Module is in External Loopback mode

110 = Module is Normal CAN 2.0 mode; possible error frames on CAN FD frames

111 = Module is Restricted Operation mode

bit 20

TXQEN: Enable Transmit Queue bit( 1)

1 = Enables TXQ and reserves space in RAM

0 = Don’t reserve space in RAM for TXQ

bit 19

STEF: Store in Transmit Event FIFO bit( 1)

1 = Saves transmitted messages in TEF and reserves space in RAM

0 = Don’t save transmitted messages in TEF

bit 18

SERR2LOM: Transition to Listen Only Mode on System Error bit( 1)

1 = Transition to Listen Only Mode

0 = Transition to Restricted Operation Mode

bit 17

ESIGM: Transmit ESI in Gateway Mode bit( 1)

1 = ESI is transmitted recessive when ESI of message is high or CAN controller error passive

0 = ESI reflects error status of CAN controller

bit 16

RTXAT: Restrict Retransmission Attempts bit( 1)

1 = Restricted retransmission attempts, CiFIFOCONm.TXAT is used

0 = Unlimited number of retransmission attempts, CiFIFOCONm.TXAT will be ignored

bit 15-13

Unimplemented: Read as ‘0’

bit 12

BRSDIS: Bit Rate Switching Disable bit

1 = Bit Rate Switching is Disabled, regardless of BRS in the Transmit Message Object

0 = Bit Rate Switching depends on BRS in the Transmit Message Object

bit 11

BUSY: CAN Module is Busy bit

1 = The CAN module is transmitting or receiving a message

0 = The CAN module is inactive

bit 10-9

WFT<1:0>: Selectable Wake-up Filter Time bits

00 = T00FILTER

01 = T01FILTER

10 = T10FILTER

11 = T11FILTER

Note:

Please refer to Table 7-5.

bit 8

WAKFIL: Enable CAN Bus Line Wake-up Filter bit( 1)

1 = Use CAN bus line filter for wake-up

0 = CAN bus line filter is not used for wake-up

bit 7

Unimplemented: Read as ‘0’

bit 6

PXEDIS: Protocol Exception Event Detection Disabled bit( 1)

A recessive “res bit” following a recessive FDF bit is called a Protocol Exception.

1 = Protocol Exception is treated as a Form Error.

0 = If a Protocol Exception is detected, the CAN FD Controller Module will enter Bus Integrating state.

bit 5

ISOCRCEN: Enable ISO CRC in CAN FD Frames bit( 1)

1 = Include Stuff Bit Count in CRC Field and use Non-Zero CRC Initialization Vector according to ISO

11898-1:2015

0 = Do NOT include Stuff Bit Count in CRC Field and use CRC Initialization Vector with all zeros

CiCON – CAN CONTROL REGISTER (CONTINUED)

Note 1:

These bits can only be modified in Configuration mode.

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