| 摘要 |
PURPOSE:To shorten the time required for the division by feeding the upper value of the divided and the divisor of the data to be applied an arithmetic processor by switching to the addition or subtraction performed with a carrier of the arithmetic result of the preceding step, then applying clocks by an amount equivalent to the input bit width of the processor. CONSTITUTION:A shift register SHR having the bit width double as much as the input bit width at one side of an arithmetic processor ALU and a 1-bit left shift function is provided to the processor ALU which works on a microprogram. In addition, a carry register CR is provided to save the carry generated to the output together with a multiplexer MPX at the other divisor input side of the processor ALU. Then an MPU selects the data obtained by converting the divisor data into a positive data as an input of the other side of the processor ALU or the numerical value obtained by inverting said data with addition of +1 in accordance with the value of the CR. Then the value of the CR is set at the lowest bit when the SHR is shifted left by a bit. This operation is repeated. |
