| 摘要 |
PURPOSE:To lighten the burden on a CPU by reading out a dial only when the CPU receives the interruption of dial receiving termination from a dial termination detection part. CONSTITUTION:A pulse counter 1 converts a dial pulse into binary code data. An interdigit supervisory part 2 reads interdigit with a clock as reference, and generates a signal for writing binary code into a pre-input and pre-output memory FIFO 4. With repeating it, binary data of the dial is accumulated in the FIFO 4. If write digit numbers into the FIFO 4 reaches a value which a digit number setting part 5 has previously set, a dial termination detection part 3 interrupts the CPU 6, which receives the dial. Thus, the CPU executes reading only when it receives interruption, whereby the burden on the CPU can be lightened.
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