| 摘要 |
Data received from a first layer is processed in a communication processor. Memory controller determines whether or not an instruction to be processed next by a processing circuit is stored in an internal RAM. When it is stored, it reads the instruction from internal RAM, and otherwise, it reads an instruction from an external ROM through an DMAC. Processing circuit changes setting of register values in respective registers in memory controller to values of the corresponding layer, when processing for one layer is completed. Consequently, the layer to be processed by the communication processor is switched.
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