| 摘要 |
PROBLEM TO BE SOLVED: To provide a CPU by which an existent assembler can be used as it is and an address space is extended by simple circuit constitution while the increase of instruction is suppressed. SOLUTION: The address signal A <15:0> of 16 bits generated when a jumping instruction is performed is decoded by a decoder 20, fixed data from outside is selected in accordance with a decoded 3-bit decode data by a selector 30 to be inputted to a CPU core 10 to output an extension address signal A<17:16> from the CPU core 10.
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