| 摘要 |
PURPOSE:To input data to both of a shift circuit constituted by connecting registers in series and a series-parallel shift register consisting of less stages of registers than said circuit in parallel and to take a fault diagnosis easily by providing both circuits. CONSTITUTION:If a fault occurs to one of a data input circuit 13, a data output circuit 14, and shift circuits 31 and 32, data inputted from the data input circuit 13 is not inputted to the shift circuits 31 and 32 correctly and not outputted from the data output circuit 14 correctly either, so it becomes difficult to specifies the fault position. For the purpose, a value set in the series-parallel shift register 1 is inputted to both or either of the shift circuits 31 and 32 selectively, and outputs of the shift circuits 31 and 32 selected through a shift selecting circuit 4 with a selection signal inputted from a terminal 10 are inputted to the series-parallel shift register 1, and outputted to a terminal 9 as serial data, which is confirmed. Consequently, the fault position of the shift circuit 31 or 32 is specified. |
