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      When operated in the powerdown mode, the TMS320C25enters a dormant
      state and requires one-half the power normally needed to supply the
      device. Powerdown mode is invoked either by executing an IDLE
                                    ____
      instruction or by driving the HOLD input low while the HM status bit
      is set to one.

      While in the powerdown mode, all of the internal contents of the
      TMS320C25 are maintained to allow operation to continue unaltered
      when powerdown mode is terminated. During that time, the data and
      address lines and the control signals are all maintained in the
                            __  __  __  ____        _
      high-impedance state (PS, DS, IS, STRB, and R/W). Powerdown mode is
      terminated upon receipt of an interrupt when an IDLE instruction is
                                          ____
      being executed or by removal of the HOLD input.