RM0402 Rev 6 959/1163
RM0402 Controller area network (bxCAN)
966
28.9.4 CAN filter registers
CAN filter master register (CAN_FMR)
Address offset: 0x200
Reset value: 0x2A1C 0E01
All bits of this register are set and cleared by software.
CAN filter mode register (CAN_FM1R)
Address offset: 0x204
Reset value: 0x0000 0000
This register can be written only when the filter initialization mode is set (FINIT=1) in the
CAN_FMR register.
Bits 23:16 DATA6[7:0]: Data Byte 6
Data byte 2 of the message.
Bits 15:8 DATA5[7:0]
: Data Byte 5
Data byte 1 of the message.
Bits 7:0 DATA4[7:0]
: Data Byte 4
Data byte 0 of the message.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. CANSB[5:0] Res. Res. Res. Res. Res. Res. Res. FINIT
rw rw rw rw rw rw rw
Bits 31:14 Reserved, must be kept at reset value.
Bits 13:8 CANSB[5:0]
: CAN start bank
These bits are set and cleared by software. When both CAN are used, they define the start
bank of each CAN interface:
000001 = 1 filter assigned to CAN1 and 27 assigned to CAN2
011011 = 27 filters assigned to CAN1 and 1 filter assigned to CAN2
– to assign all filters to one CAN set CANSB value to zero and deactivate the non
used CAN
– to use CAN1 only: stop the clock on CAN2 and/or set the CAN_MCR.INRQ on
CAN2
– to use CAN2 only: set the CAN_MCR.INRQ on CAN1 or deactivate the interupt
register CAN_IER on CAN1
Bits 7:1 Reserved, must be kept at reset value.
Bit 0 FINIT
: Filter initialization mode
Initialization mode for filter banks
0: Active filters mode.
1: Initialization mode for the filters.
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