| 摘要 |
PURPOSE:To always encode the same data to the same encoded data by providing an encoding start deciding means and a clock control means to an encoding circuit to start encoding after the encoding start deciding means has recognized an encoding start data. CONSTITUTION:When D3-D0 of an input register 1 go to '1100', a conversion start deciding circuit 4 detects it and a '1100' signal is outputted, a 'Look For Key' signal goes to 'H', and an output signal 22 of the conversion start deciding circuit 4 goes to 'L'. As a result, an encoding start data is recognized. The output signal 22 of the conversion start deciding circuit 4 is inputted to a clock controlling circuit 5, and a 'LOAD GAP' signal of it output signal 23 is inverted to 'L'. In such a way, a shift instruction signal can be outputted for the first time, and thereafter, an encoding circuit 2 is operated as usual and encoding is executed.
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