| 摘要 |
PURPOSE:To record new dial data accurately even during telephone service by inhibiting dial information from being read out of a memory by a mode switching signal for nonservice/service mode switching. CONSTITUTION:An FF38 for mode switching is reset when telephone service is off, and a gate circuit 42 is in an off state to hold the reception of an external dial request signal 16 in readiness. An external recording mode signal 37 is at a level L, so a gate circuit 39 is ready to accept a write pointer preset signal 5 from a memory write control circuit 1. When a recording signal 37 is inputted in recording mode, on the other hand, a write pointer 4 is preset in an address 00 through the gate circuit 39. Further, the FF38 is set to inhibit reading operation in recording mode. Therefore, new dial data is recorded accurately during service. |
