JPS6454528A - Processor - Google Patents

Abstract

PURPOSE:To execute an arithmetic processing and a transfer without deteriorating the accuracy, even when the number of its of a mantissa of a floating point is long, by providing a mantissa register, an exponential part register, and terminals for inputting and outputting separately their contents. CONSTITUTION:A part of a mantissa of a floating point data is stored in mantissa registers 31, 32 and 41, 42 in digital signal processing circuits 24, 25, an exponential part and the residual part of the mantissa are stored in exponential part registers 33, 34 and 43, 42 and the contents of the registers 31, 32 and 41, 42 and the contents of the registers 33, 34 and 43, 44 and outputted separately, for instance, from output terminals 51, 52 of the circuit 24, respectively, and inputted separately by input terminals 61, 62 of the circuit 25 in accordance therewith. In such a way, even when the number of bits of the mantissa of the floating point data which is brought to arithmetic processing is longer than the bit length of a fixed point data handled at the outside, an arithmetic processing and a transfer can be executed, based on a common clock signal, and also, the accuracy is not deteriorated.