| 摘要 |
<p>PURPOSE:To perform operation dealing with more bits than those of a system without increasing the number of cycles by setting the frequency of the clock in a CPU to an integral multiple of the clock frequency of a peripheral circuit. CONSTITUTION:The CPU consists of a controller 1 having a sequence circuit, instruction register 2, ALU (arithmetic logical unit) 3, a group of registers 4a- 4i, etc. The operation of the ALU3 is performed by a control signal generated on the basis of an operation clock phic supplied form a signal generating circuit 8 to the controller 1. The frequency of said operation clock signal, i.e. clock signal phic is set to an integral multiple of the frequency of system clock signal Pc1- Pc3 supplied from the signal generating circuit 8 to peripheral circuits of the CPU such as an ROM5, RAM6, and I/O port 7.</p> |
