Microcomputer executing compressed program and generating compressed branch addresses

An executable program is stored in compressed form in a ROM, from which compressed program data is fetched to be expanded by an expandor to a pre-compression form. The expanded data is then decoded by an instruction decoder for execution. This novel setup reduces a memory usage amount in main storag...

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Bibliographic Details
Main Authors YAJIMA; HIROSHI, KASHIWAGI; YUGO
Format Patent
LanguageEnglish
Published 20.05.1997
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:An executable program is stored in compressed form in a ROM, from which compressed program data is fetched to be expanded by an expandor to a pre-compression form. The expanded data is then decoded by an instruction decoder for execution. This novel setup reduces a memory usage amount in main storage including the ROM. If a branch instruction appears, a controller converts a pre-compression branch destination address to a corresponding post-compression branch destination address and sets a value thereof to a program counter.
Bibliography:Application Number: US19950515398