| 摘要 |
PURPOSE:To enable usual charge and discharge operation even in a reset state, by providing a first circuit for resetting only a motor driving circuit when a stepping motor is stopped by stem operation and a second circuit resetting a frequency dividing period for a short time immediately after the stem operation is released. CONSTITUTION:A first resetting circuit 8 is a conventional one and, when said circuit 8 comes to a reset state, a terminal 9 comes to 'H' and information is read through a chattering preventing circuit. When the output of FF15 comes to 'H', resetting is applied to a motor driving circuit 5 and a frequency divider 2 is not reset and, therefore, a voltage detection means 4 functions in a usual manner. A second resetting circuit 7 is constituted of FF16, a latch 17 and a NOR gate 18 and emits a single pulse within 0.98msec after the release of resetting to reset frequency dividing stages on and after 512Hz and outputs a stepping motor driving wave form after about sec. By this constitution, it is possible to perform charging and discharging operation without adding other element regardless of the times of resetting and non-resetting. |
