| 摘要 |
In a control circuit including an A/D converter, a parallel-to-serial input buffer, a parallel input buffer, a serial-to-parallel output buffer and a parallel output buffer which are built in a chip, provided with a microcomputer, an A/D conversion is carried out by controlling a time of an A/D conversion conducted by the A/D converter correspondingly to a condition of an output port of the output buffer, thereby preventing an A/D converted value from being affected by an inversion in the output of the buffer.
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