A micro-controller includes a dictionary memory for storing instruction codes
which
appear in a program, and a compressed code memory for storing compressed codes
each converted from each of the instruction codes included in the program. Each
compressed code has a word length sufficiently long to identify all instruction
codes included in the program. Each compressed code has a value indicative of an
address in the dictionary memory at which an associated instruction code is stored.
The micro-controller is responsive to an instruction code read request which specifies
an address of a compressed code to read the compressed code stored in the specified
address in the compressed code memory, and to subsequently read an instruction
code stored in an address indicated by the compressed code in the dictionary memory.
