| 摘要 |
<p>PURPOSE:To execute a user program larger than a directly designatable address space with an internal address bus width by incorporating an address preparing circuit, executing a bank switching and extending a program space. CONSTITUTION:An external extending circuit 13 reads an instruction from an external memory 19 address-designated by an address bus 3 and outputs it to a data bus 4. The external extending circuit 13 provides an address generating circuit 12A to increment a present value with a carry signal 100 of a program counter 1 outputted from a CPU and output it to the external memory 19 as the high order address of the address transferred through the address bus 3.</p> |
