| 摘要 |
PROBLEM TO BE SOLVED: To provide a comparator switching circuit capable of surely preventing output of a signal of an indefinite level to the outside even when operating states of two comparators are switched according to an operation mode. SOLUTION: An operation switching circuit 11 generates a delayed signal by delaying a mode switching signal outputted by a microcomputer 4 via a delay circuit 12, performs logic synthesis of the delay signal and the mode signal by an OR gate 13 and an AND gate 14, and when COMP1, COMP2 control signals with different high level periods are generated, switches operations via a period in which any one of the comparators 1, 2 is in the operating state by the control signals, when the operations of the comparators 1, 2 which receive communication data transmitted from the outside and decide binary levels are switched. In addition, selection and switching of a multiplexer 3 are performed by the output signal of the delay circuit 12. COPYRIGHT: (C)2006,JPO&NCIPI
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