没有 具体的针对对象（CAN控制器型号） 讨论起来 意义不大。 AT90CAN128/64/32 内置的 CAN控制器 有15个MOB
15 MOb (Message Object) with their own: – 11 bits of Identifier Tag (rev 2.0 A), 29 bits of Identifier Tag (rev 2.0 B) – 11 bits of Identifier Mask (rev 2.0 A), 29 bits of Identifier Mask (rev 2.0 B) – 8 Bytes Data Buffer (Static Allocation) – Tx, Rx, Frame Buffer or Automatic Reply Configuration – Time Stamping
关于缓冲的描述： CAN Data Buffers To preserve register allocation, the CAN data buffer is seen such as a FIFO (with address pointer accessible) into a MOb selection.This also allows to reduce the risks of un-controlled accesses. There is one FIFO per MOb. This FIFO is accessed into a MOb page thanks to the CAN message register.
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