MSM9225 Datasheet, PDF (31/74 Pages) OKI electronic componets – CAN (Controller Area Network) Controller

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3. Receive Procedure
The receive procedure is indicated below.
Receive procedure
MSM9225
(MSM9225)
Interrupt signal is generated when
reception is complete
INT: 1 Æ 0
Verify that IRF bit of CANI register
(0Fhex) is "1"
*) Verify that the interrupt is caused by the
reception completion.
Set IRF bit of CANI register
(0Fhex) to "0"
Verify reception message number
with TMN register (9Ehex)
Set RCS bit of inside message
control register (X0hex) to "0"
Read reception data from
data memory
Inside message
control register's
RCS = 0?
YES
CANC register's (0Ehex)
NO
CANA = 0?
YES
Receive complete
*) Check whether new reception data has
NO ^{been written to the same message while data}
was being read.
*) Check whether reception data has been written
to another message while data was being read.
This step may be omitted and evaluation performed
based on the interrupt signal.
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