M_CAN_TXBRP field descriptions (continued)
Field Description
In DAR mode all transmissions are automatically cancelled if they are not successful. The corresponding
TXBCF bit is set for all unsuccessful transmissions.
0 No transmission request pending
1 Transmission request pending
3.3.37 Tx Buffer Add Request Register (M_CAN_TXBAR)
NOTE
If an add request is applied for a Tx Buffer with pending
transmission request (corresponding TXBRP bit already set),
this add request is ignored.
Address: 0h base + D0h offset = D0h
Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
AR
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
M_CAN_TXBAR field descriptions
Field Description
0–31
AR
Add Request
Each Tx Buffer has its own Add Request bit. Writing 1 will set the corresponding Add Request bit; writing 0
has no impact. This enables the CPU to set transmission requests for multiple Tx Buffers with one write to
TXBAR. TXBAR bits are set only for those Tx Buffers configured via TXBC. When no Tx scan is running,
the bits are reset immediately, else the bits remain set until the Tx scan process has completed.
0 No transmission request added
1 Transmission requested added
3.3.38 Tx Buffer Cancellation Request Register (M_CAN_TXBCR)
Address: 0h base + D4h offset = D4h
Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
CR
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Chapter 3 Modular CAN (M_CAN)
MPC5777C Reference Manual Addendum, Rev. 1, 12/2015
Freescale Semiconductor, Inc. 73
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