Entry apparatus of digital value in memory

摘要

The reference signal output from a reference oscillator is applied to a counter where the reference signal is counted to provide a count output as a changeable digital value. A saw-tooth wave generator is provided so as to generate a saw-tooth wave such that the saw-tooth wave is changeable of the waveform in synchronism with the count output. A comparison voltage generator is also provided which may typically comprise a variable resistor. A load enable signal generator is provided to receive the saw-tooth wave output from the saw-tooth wave generator and the comparison voltage output as set in the comparison voltage generator. The load enable signal generator is structured to compare the saw-tooth wave output and the comparison voltage output to provide a load enable signal whenever both outputs coincide with each other. A digital memory is provided to be responsive to the load enable signal from the load enable signal generator to load therein the count output representing a digital value in the counter which has been attained when the load enable signal is obtained.