| 摘要 |
<p>PURPOSE:To enable to decrease the number of external connection pins greatly by inputting microinstructions from a control memory part and transmitting and receiving main memory information and input-output information via the same bus. CONSTITUTION:Arithmetic controller 101, made into one chip of a very high scale integrated semiconductor device, is controlled by external control memory part 102 stored with a microprogram. Then, common bus 103 is provided as a common communication path between controller 101 and an external device and output data of control part 102, memory addresses and memory data of the main memory and I/O data arrive in time-division mode. The number of external connection pins can, therefore, be decreased greatly by transmitting and receiving those signals via bus 103.</p> |
