RM0440 Rev 4 1999/2126
RM0440 FD controller area network (FDCAN)
2008
44.4.28 FDCAN Tx buffer request pending register (FDCAN_TXBRP)
Address offset: 0x00C8
Reset value: 0x0000 0000
Note: TXBRP bits set while a Tx scan is in progress are not considered during this particular Tx
scan. In case a cancellation is requested for such a Tx Buffer, this Add Request is canceled
immediately, the corresponding TXBRP bit is reset.
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. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. TRP[2:0]
rrr
Bits 31:3 Reserved, must be kept at reset value.
Bits 2:0 TRP[2:0]: Transmission request pending
Each Tx Buffer has its own transmission request pending bit. The bits are set via register
TXBAR. The bits are reset after a requested transmission has completed or has been
canceled via register TXBCR.
After a TXBRP bit has been set, a Tx scan is started to check for the pending Tx request with
the highest priority (Tx Buffer with lowest Message ID).
A cancellation request resets the corresponding transmission request pending bit of register
TXBRP. In case a transmission has already been started when a cancellation is requested,
this is done at the end of the transmission, regardless whether the transmission was
successful or not. The cancellation request bits are reset directly after the corresponding
TXBRP bit has been reset.
After a cancellation has been requested, a finished cancellation is signaled via TXBCF
after successful transmission together with the corresponding TXBTO bit
when the transmission has not yet been started at the point of cancellation
when the transmission has been aborted due to lost arbitration
when an error occurred during frame transmission
In DAR mode all transmissions are automatically canceled if they are not successful. The
corresponding TXBCF bit is set for all unsuccessful transmissions.
0: No transmission request pending
1: Transmission request pending
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