MICROCOMPUTER, BUS CONTROL CIRCUIT, AND DATA ACCESS METHOD FOR MICROCOMPUTER

摘要

PROBLEM TO BE SOLVED: To efficiently access a plurality of devices differed in access speed by use of a common bus.;SOLUTION: When a second access request to a second device 4 is generated from a CPU 2 during an access processing according to a first access request to a first device 3, an access completion time determination part 5a determines the antedate-postdate relation between the completion time of the access processing to the first device 3 and the earliest time of the access processing to the second device 4 can be completed. When it is determined that the access processing to the second device 4 can be completed earlier than the completion time of the access processing to the second device 4, the access to the second device 4 according to the second access request is executed by a bus access part 5b during the access processing cycle according to the first access request to the first device 3.;COPYRIGHT: (C)2003,JPO