| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily obtain an oscillation frequency that is expected by an oscillator circuit. SOLUTION: Correction data that corresponds to an error between an expected oscillation frequency and the oscillation frequency of a present state is written in non-volatile memory 10, beforehand. When the reset of a one-chip microcomputer is released, the correction data is read from the non-volatile memory and set to a register, based on a decoded result of a program instruction that is stored in a specific address on ROM 11. With this, the opening and closing of switch circuits 9-1 to 9-n are controlled, and an oscillation frequency is adjusted. After that, the ROM 11 jumps to a heading address, and a normal operation is carried out.</p> |
