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Controller area network (bxCAN)
RM0008
Bits 25:24 SJW[1:0] : Resynchronization jump width
These bits define the maximum number of time quanta the CAN hardware is allowed to
lengthen or shorten a bit to perform the resynchronization.
t RJW = t CAN x (SJW[1:0] + 1)
Bit 23
Reserved, forced by hardware to 0.
Bits 22:20 TS2[2:0] : Time segment 2
These bits define the number of time quanta in Time Segment 2.
t BS2 = t CAN x (TS2[2:0] + 1)
Bits 19:16 TS1[3:0] : Time segment 1
These bits define the number of time quanta in Time Segment 1
t BS1 = t CAN x (TS1[3:0] + 1)
For more information on bit timing, please refer to Section 22.7.7: Bit timing on page 558 .
Bits 15:10
Reserved, forced by hardware to 0.
Bits 9:0 BRP[9:0] : Baud rate prescaler
These bits define the length of a time quanta.
t q = (BRP[9:0]+1) x t PCLK
22.9.3
CAN mailbox registers
This chapter describes the registers of the transmit and receive mailboxes. Refer to
Section 22.7.5: Message storage on page 556 for detailed register mapping.
Transmit and receive mailboxes have the same registers except:
●
●
●
The FMI field in the CAN_RDTxR register.
A receive mailbox is always write protected.
A transmit mailbox is write-enabled only while empty, corresponding TME bit in the
CAN_TSR register set.
There are 3 TX Mailboxes and 2 RX Mailboxes. Each RX Mailbox allows access to a 3 level
depth FIFO, the access being offered only to the oldest received message in the FIFO.
Each mailbox consist of 4 registers.
CAN_RI0R
CAN_RDT0R
CAN_RL0R
CAN_RH0R
CAN_RI1R
CAN_RDT1R
CAN_RL1R
CAN_RH1R
CAN_TI0R
CAN_TDT0R
CAN_TDL0R
CAN_TDH0R
CAN_TI1R
CAN_TDT1R
CAN_TDL1R
CAN_TDH1R
CAN_TI2R
CAN_TDT2R
CAN_TDL2R
CAN_TDH2R
572/995
FIFO0
FIFO1
Doc ID 13902 Rev 9
Three Tx Mailboxes
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