| 摘要 |
A paging receiver includes a receiver for demodulating a modulated wave received by an antenna, a decoder for decoding a demodulated wave outputted from the receiver, a central processing unit serving as a concentrated operation unit in the paging receiver, a ROM in which programs to be executed by the central processing unit and data are stored in a plurality of bank modes, a RAM for managing a bank when the central processing unit accesses the ROM, and a demodulated data outputting apparatus. The central processing unit accesses, each time it is to access the ROM, the ROM through the decoder, and the decoder decodes an address signal inputted thereto from the central processing unit and outputs a chip select signal for selecting the ROM and other components. Further, the decoder performs switching selection of a plurality of bank modes. To this end, the decoder includes a bank mode switching register. The register has a hardware initial value and a bank switch value for selectively setting one of the plurality of bank modes upon initialization operation by software, and one of the plurality of bank modes is selectively set in accordance with one of the hardware initial value and a bank switch value by the software. By the construction, when the capacity of the ROM is severe, the capacity of the ROM can be assured sufficiently only by switchably selecting one of the bank modes, and software designing can be proceeded only by some change of design. <IMAGE> |
