| 摘要 |
<p>PURPOSE:To eliminate the need of a different control circuit for wait at the time of executing an access to a low speed memory or a low speed register by instructing a clock period from a microprocessor circuit, and setting it as a necessary clock period. CONSTITUTION:A clock control circuit 11 is provided, a clock period of a clock circuit 12 is converted, based on an instruction of a microprocessor circuit 10, and by a clock of this circuit 11, the circuit 10 controls a superordinate interface circuit 13 and a subordinate interface circuit 14. In such a state, at the time of executing an access of a low speed memory or a low speed register, in such a way, a clock is converted to a low speed in the circuit 11 by an instruction of the circuit 10, therefore, the access can be executed without executing an instruction of wait to the circuit 10.</p> |
