Multiplier accumulator

专利名称：Multiplier accumulator发明人：Nakamura, Kimiko申请号：EP93110441.8申请日：19930630公开号：EP0577101B1公开日：19990506

摘要：A microcomputer of the present invention comprises a multiplication circuit(101) for multiplication of a multiplier and a multiplicand data, a ripple carry adder (102)for addition of the data and the carry from the multiplication circuit and addition of themultiplication results, a multiplication result holding register (108) to hold the

multiplication result obtained by the addition of said data and the carry from the ripplecarry adder, a product-sum operation result holding register (109) to hold the product-sum operation result obtained by addition of the multiplication results at the ripple carryadder, a selector (106) to selectively input the data or the carry from the multiplicationcircuit or the multiplication result held at the multiplication result holding register to theripple carry adder, another selector (107) to selectively input the data or the carry fromthe multiplication circuit or the product-sum operation result held at the product-sumoperation result holding register to the ripple carry adder and a still another selector(112) to selectively output the multiplication result or the product-sum operation resultheld at the multiplication result holding register or the product-sum operation resultholding register.

申请人：NEC CORP

地址：JP

国籍：JP

代理机构：Betten & Resch

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