| 摘要 |
<p>PURPOSE:To inexpensively produce this microcomputer without using a multilayer substrate by providing the microcomputer with an I/O selector so as to connect variably peripheral processors to I/O ports. CONSTITUTION:Respective peripheral processors 102, 103 are connected to respective I/O ports 105, 104. A switch 210 in an I/O register 201 built in an I/O selector 107 is connected to the power supply side, a signal 208 is turned to logic value '1' and a signal 209 is turned to logic value '0', so that a bus 109 is connected to a bus 111. Similarly, an output signal 212 from an I/O register 202 is turned to logic value '1' and a signal 211 is turned to logic value '0' to connect a bus 110 to a bus 112. Consequently, the microcomputer can be inexpensively produced without using a multilayer substrate.</p> |
