A data processing method of a wireless communication system includes generating an identity code corresponding to a receiver, storing the identity code in a receiver, exclusive-oring output data with the identity code corresponding to the receiver, outputting the exclusive-ored data, receiving data at a receiver, and exclusive-oring the received data with an identity code stored in the receiver. A method is provided for a hybrid cache system that dynamically changes modes of one or more cache rows of a cache between an un-split mode having a first tag field and a first data field to a split mode having a second tag field, a second data field being smaller than the first data field and a mapped page field to improve the cache access efficiency of a workflow being executed in a processor. When the portable electronic device receives a direct current voltage provided by an external transformer to conduct a startup procedure, the battery detector detects whether the battery module is connected to the portable electronic device or not, and prevents the portable electronic device from conducting erroneous operations. The light assembly includes a plurality of reflectors.