单片机英文介绍.doc

Patent Application#20080263228 PDF US20080263228A1.pdf(opens in new window or tab) *NEW USERS: You get a few patent PDF downloads without being logged in.For additional downloads, you can Register (FREE).PDF Troubleshooting:Adobe PDF FAQ. If you need more help, check with support. NOTES: 1. The PDF link above is a temporary URL and stops working after 15 minutes.2. This PDF feature is in Beta, which means we are still testing it and there may be periods of unavailability.3. If you are having technical issues or have a suggestion for improvement, please contact us:Technical Support form Buses Central Processing Unit External Bus H And H Internal Bus Microcomputer BACKGROUND OF THE INVENTION The present invention relates to a single-chip microcomputer and, more particularly, to a technique which is effective when applied to a high-performance and high-function single-chip microcomputer suited for a home game machine or a portable data communication terminal device. There is a single-chip microcomputer or a single-chip data processor in which a central processing unit, a dynamic memory access controller, (as will be shortly referred to as the “DMAC”) and a peripheral circuit such as a variety of timers are constructed into a semiconductor integrated circuit device. An example of this single-chip microcomputer is disclosed in “HITACHI Single-Chip RISC Microcomputer SH7032, SH7034 HARDWARE MANUAL” issued by Hitachi Ltd., in March, 1993. Thanks to development of the semiconductor technology, a number of semiconductor elements can be formed over one semiconductor substrate. As a result, around the central processing unit, there can be formed its peripheral circuits to enhance the performance and function. If, however, a number of peripheral circuits are simply packaged for the higher performance and more functions, it has been found that disadvantages are caused from the standpoint of the operation speed or the power dissipation. Moreover, this