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RM0016
Controller area network (beCAN)
427
23.11.12 CAN receive error counter register (CAN_RECR)
Address offset: See Table 71.
Reset value: 0000 0000 (00h)
23.11.13 CAN bit timing register 1 (CAN_BTR1)
Address offset: See Table 71.
Reset value: 0100 0000 (40h)
This register can only be accessed by the software when the CAN hardware is in
initialization mode.
7
654
3210
REC[7:0]
r
rrr
rrrr
Bits 7:0 REC[7:0] Receive error counter
This is the Receive Error Counter implementing part of the fault confinement mechanism of the CAN
protocol. In case of an error during reception, this counter is incremented by 1 or by 8 depending on
the error condition as defined by the CAN standard. After every successful reception the counter is
decremented by 1 or reset to 120 if its value was higher than 128. When the counter value exceeds
127, the CAN controller enters the error passive state.
7
654
3210
SJW[1:0]
BRP[5:0]
rw
rw
rw
rw
rw
rw
rw
rw
Bits 7:6 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. Resynchronization Jump Width = (SJW+1).
Bits 5:0 BRP[5:0] Baud rate prescaler
These bits define the length of a time quantum.
tq = (BRP+1)/fMASTER



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