12.2.14 CAN Control Register High

Note:

These bits can only be modified in Configuration mode (OPMOD[2:0] = 100).

Legend: S = Settable bit; HC = Hardware Clearable bit

Name:	C1CONH
Offset:	0x6C2


Bit	15	14	13	12	11	10	9	8
	TXBWS[3:0]				ABAT	REQOP[2:0]
Access	R/W	R/W	R/W	R/W	S/HC	R/W	R/W	R/W
Reset	0	0	0	0	0	1	0	0


Bit	7	6	5	4	3	2	1	0
	OPMOD[2:0]			TXQEN	STEF	SERRLOM	ESIGM	RTXAT
Access	R	R	R	R/W	R/W	R/W	R/W	R/W
Reset	1	0	0	1	1	0	0	0

Bits 15:12 – TXBWS[3:0] Transmit Bandwidth Sharing bits

Value	Description
`1111-1100`	4096
`1011`	2048
`1010`	1024
`1001`	512
`1000`	256
`0111`	128
`0110`	64
`0101`	32
`0100`	16
`0011`	8
`0010`	4
`0001`	2
`0000`	No delay

Bit 11 – ABAT Abort All Pending Transmissions bit

Value	Description
`1`	Signals all transmit buffers to abort transmission
`0`	Module will clear this bit when all transmissions are aborted

Bits 10:8 – REQOP[2:0] Request Operation Mode bits

Value	Description
`111`	Sets Restricted Operation mode
`110`	Sets Normal CAN 2.0 mode; error frames on CAN FD frames
`101`	Sets External Loopback mode
`100`	Sets Configuration mode
`011`	Sets Listen Only mode
`010`	Sets Internal Loopback mode
`001`	Sets Disable mode
`000`	Sets Normal CAN FD mode; supports mixing of full CAN FD and classic CAN 2.0 frames

Bits 7:5 – OPMOD[2:0] Operation Mode Status bits

Value	Description
`111`	Module is in Restricted Operation mode
`110`	Module is in Normal CAN 2.0 mode; error frames on CAN FD frames
`101`	Module is in External Loopback mode
`100`	Module is in Configuration mode
`011`	Module is in Listen Only mode
`010`	Module is in Internal Loopback mode
`001`	Module is in Disable mode
`000`	Module is in Normal CAN FD mode; supports mixing of full CAN FD and classic CAN 2.0 frames

Bit 4 – TXQEN Enable Transmit Queue bit⁽¹⁾

Value	Description
`1`	Enables Transmit Message Queue (TXQ) and reserves space in RAM
`0`	Does not reserve space in RAM for TXQ

Bit 3 – STEF Store in Transmit Event FIFO bit⁽¹⁾

Value	Description
`1`	Saves transmitted messages in TEF
`0`	Does not save transmitted messages in TEF

Bit 2 – SERRLOM Transition to Listen Only Mode on System Error bit⁽¹⁾

Value	Description
`1`	Transitions to Listen Only mode
`0`	Transitions to Restricted Operation mode

Bit 1 – ESIGM Transmit ESI in Gateway Mode bit⁽¹⁾

Value	Description
`1`	ESI is transmitted as recessive when ESI of the message is high or CAN controller is error passive
`0`	ESI reflects error status of CAN controller

Bit 0 – RTXAT Restrict Retransmission Attempts bit⁽¹⁾

Value	Description
`1`	Restricted retransmission attempts, uses TXAT[1:0] bits (C1TXQCONH[6:5])
`0`	Unlimited number of retransmission attempts, TXAT[1:0] bits will be ignored

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