Hitachi, Ltd.

Hitachi Vlsi Engineering Corp.

Hitachi Microcomputer Engineering, Ltd.

Tomoru Sato

Yoshimune Hagiwara

Atsushi Kiuchi

Tetsuya Nakagawa

Kenji Kaneko

Jun Ishida

Hirotada Ueda

Hitoshi Matsushima

Shigeki Masumura

Takashi Akazawa

Noriyasu Suzuki

In a single chip processor which can be provided with an extended program memory, a high-speed access can be executed without being restricted by the access time for the external program memory when an internal program memory is employed, by varying the effective instruction cycle, and thus a high-speed processing performance for a single chip processor of a stored program type can be attained.

Single chip processor

A plurality of external input information are added to a selecting circuit. The output of the selecting circuit is fed back as one of the external input information to the selecting circuit. The input signal groups are decoded, and are produced as control signals to specify the external input information in synchronism with clock signals. When the input select signal groups have the non-selection mode, the output that is fed back is necessarily selected.

Selecting means for selecting a plurality of information

An LSI system is disclosed in which a plurality of status registers for indicating the internal status of the system are connected to each other so as to form a hierarchical structure and the contents of each of the remaining status registers other than one status register can be transferred to an output register through a bus, to make it possible to provide additional status registers in the system without increasing the number of address signals used and the number of pins connected to external address signal lines.

LSI system of a structure requiring no additional address signals to

Growing community of inventors

Kodaira, Japan

Tomoru Sato