Appeal No. 1999-0485
Application 08/526,781
have been canceled.
The invention relates to operation apparatus that can be
used in general-purpose microcomputers or the like, and more
particularly, to improvement of an operation apparatus for
digital signal processing.
Independent claim 1 is reproduced as follows:
1. An operation apparatus for carrying out an
instruction specifying a combined operation of an arithmetic
operation and a shifting operation using digital data of n bit
length, comprising:
instruction decoding means for decoding the instruction
into an arithmetic instruction indicative of the arithmetic
operation of the instruction and a shifting instruction
indicative of the shifting operation of the instruction;
arithmetic operation means, coupled to said instruction
decoder means, for receiving said digital data, carrying out
one of a plurality of arithmetic and logical operations
according to the arithmetic instruction in response to said
digital data, and providing an operation resultant data of 2n
bit length over one of a plurality of outputs in which at
least precision of said combined operation is guaranteed;
selection means, coupled to said arithmetic operation
means, for selecting the one of the plurality of outputs on
which said operation resultant data is provided in accordance
with a selection signal provided by said instruction decoding
means;
2
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