| 摘要 |
PURPOSE:To prevent noise from being introduced by using a command control voltage of a central controller to decrease the time constant of a low pass noise filter provided to a bus line at the transfer of a control data. CONSTITUTION:Low pass noise filters 3A-3D are provided to bus lines 11-14 transferring the control data from the central controller 1 to a phase locked loop oscillator 2. The command voltage 15 of the central controller 1 decreases the time constant of the filters 3A-3D at the transfer of the control data. In this case, the control data is transferred to the phase locked loop oscillator 2 from output ports P1-P4 of the central controller through the bus lines 11-14 and the noise filters 3A-3D. |
