Functional Operation; Can Interrupts - Analog Devices ADSP-BF506F Hardware Reference Manual

Functional Operation

logic and the data length code of the incoming message is written to the
corresponding mailbox. However, the message being requested is not sent
until the temporary disable request is cleared (
mit requests for temporarily disabled mailboxes are ignored until
cleared. Additionally, transmission of a message is immediately aborted if
the mailbox is temporarily disabled and the corresponding
this mailbox is set.
If a mailbox is configured as "receive" (
is set and the mailbox is not processed. If there is an incoming message for
the mailbox n being temporarily disabled, the internal logic waits until the
reception is complete or there is an error on the CAN bus to set
is set, the mailbox can then be completely disabled (
TDA
the risk of losing an incoming frame. The temporary disable request (
bit must then be reset as soon as possible.
When is set for a given mailbox, only the data field of that mailbox
TDA
can be updated. Accesses to the control bits and the identifier are denied.
Functional Operation
The following sections describe the functional operation of the CAN
module, including interrupts, the event counter, warnings and errors,
debug features, and low power features.

CAN Interrupts

The CAN module provides three independent interrupts: two mailbox
interrupts (mailbox receive interrupt
rupt ) and the global CAN interrupt
MBTIRQ
interrupts can also be read back in the interrupt status registers.
17-22
MBRIRQ
ADSP-BF50x Blackfin Processor Hardware Reference
= ). Similarly, all trans-
TDR 0
= ), the temporary disable flag
MDn 1
MCn
and mailbox transmit inter-
. The values of these three
GIRQ
is
TDR
bit for
TRRn
. Once
TDA
= ) without
0
)
TDR