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Burst Mode Data Read
For faster access to a complete message the burst read mode is applicable.
In burst read mode the complete message is copied from the internal message buffer to a tempo-
rary read buffer located outside the CAN memory section. This allows read access without any
wait, if the CAN memory is accessed by the CAN modules while the CPU tries to read data.
The copy of the message is automatically started whenever the data length code from the
M_DLCm register is read by the CPU, and the data is copied from the message buffer into the
temporary buffer. As long as the CPU reads 16-bit data from consecutive addresses (that means
16 -bit burst read sequence M_DLCm/M_CTRLm → M_TIMEm → M_DATAm0/m1 → M_DATAm2/
m3 → M_DATAm4/m5 → M_DATAm6/m7 → M_IDLm → M_IDHm) the data is read from the tem-
porary buffer.
Caution:
The burst read requires consecutive 16-bit read accesses to the memory area. Any
8-bit access (byte read operation), even if not violating the linear address rule,
causes that the read is performed from the register instead of the temporary buffer.
Chapter 14 FCAN Interface Function
Preliminary User's Manual U15839EE1V0UM00
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