MCP2517FD datasheet(25/98 Pages) MICROCHIP

25 / 98 page

 2017-2018 Microchip Technology Inc.

DS20005688B-page 25

MCP2517FD

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)

= Enables TXQ and reserves space in RAM

= Don’t reserve space in RAM for TXQ

bit 19

STEF

: Store in Transmit Event FIFO bit( 1)

= Saves transmitted messages in TEF and reserves space in RAM

= Don’t save transmitted messages in TEF

bit 18

SERR2LOM

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

= Transition to Listen Only Mode

= Transition to Restricted Operation Mode

bit 17

ESIGM

: Transmit ESI in Gateway Mode bit( 1)

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

= ESI reflects error status of CAN controller

bit 16

RTXAT

: Restrict Retransmission Attempts bit( 1)

= Restricted retransmission attempts, CiFIFOCONm.TXAT is used

= 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

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

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

bit 11

BUSY

: CAN Module is Busy bit

= The CAN module is transmitting or receiving a message

= The CAN module is inactive

bit 10-9

WFT<1:0>

: Selectable Wake-up Filter Time bits

= T00FILTER

= T01FILTER

= T10FILTER

= T11FILTER

Note:

Please refer to Table 7-5.

bit 8

WAKFIL

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

= Use CAN bus line filter for wake-up

= 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.

= Protocol Exception is treated as a Form Error.

= 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)

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

11898-1:2015

= 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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