| 摘要 |
A memory control circuit for controlling a write-in operation of an addressable memory circuit whereby a digital signal that is changeable over time is written into an addressed location in the memory circuit. An address register is provided for selecting the addressed location in the memory into which the digital signal is to be written. A control signal generator senses when a digital signal to be written into the memory circuit remains unchanged for a predetermined time interval so as to generate a control signal, this control signal being supplied to the address register for selecting the addressed location, and also being supplied to the memory circuit to initiate the write-in operation. If the digital signal does not remain constant for this predetermined interval, the write-in operation thereof is not carried out. A preferred application of the present invention is to control a memory incorporated into an electronic radio frequency tuner, which memory is adapted to store a digital signal representing the last radio frequency which was received immediately prior to the interruption of power.
|
