Information
CANx_RXMGMASK field descriptions (continued)
Field Description
SMB[RTR]
1
CTRL2[RRS] CTRL2[EACE
N]
Mailbox filter fields
MB[RTR] MB[IDE] MB[ID] Reserved
0 - 0 note
2
note
3
MG[28:0] MG[31:29]
0 - 1 MG[31] MG[30] MG[28:0] MG[29]
1 0 - - - - MG[31:0]
1 1 0 - - MG[28:0] MG[31:29]
1 1 1 MG[31] MG[30] MG[28:0] MG[29]
1. RTR bit of the Incoming Frame. It is saved into an auxiliary MB called Rx Serial Message Buffer (Rx
SMB).
2. If the CTRL2[EACEN] bit is negated, the RTR bit of Mailbox is never compared with the RTR bit of the
incoming frame.
3. If the CTRL2[EACEN] bit is negated, the IDE bit of Mailbox is always compared with the IDE bit of the
incoming frame.
0 The corresponding bit in the filter is "don't care."
1 The corresponding bit in the filter is checked.
1. RTR bit of the Incoming Frame. It is saved into an auxiliary MB called Rx Serial Message Buffer (Rx SMB).
2. If the CTRL2[EACEN] bit is negated, the RTR bit of Mailbox is never compared with the RTR bit of the incoming frame.
3. If the CTRL2[EACEN] bit is negated, the IDE bit of Mailbox is always compared with the IDE bit of the incoming frame.
45.3.6 Rx 14 Mask register (CANx_RX14MASK)
This register is located in RAM.
RX14MASK is provided for legacy application support. When the MCR[IRMQ] bit is
asserted, RX14MASK has no effect.
RX14MASK is used to mask the filter fields of Message Buffer 14.
This register can only be programmed while the module is in Freeze mode as it is blocked
by hardware in other modes.
Address: 4002_4000h base + 14h offset = 4002_4014h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
RX14M[31:0]
W
Reset
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
CANx_RX14MASK field descriptions
Field Description
31–0
RX14M[31:0]
Rx Buffer 14 Mask Bits
Each mask bit masks the corresponding Mailbox 14 filter field in the same way that RXMGMASK masks
other Mailboxes' filters. See the description of the CAN_RXMGMASK register.
Memory map/register definition
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
1122
Preliminary
Freescale Semiconductor, Inc.
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