| 摘要 |
<p>PROBLEM TO BE SOLVED: To correct the variation of the detection reference of a low voltage. SOLUTION: At the time of shipping one chip microcomputer, selection data for correcting the threshold voltage of an invertor in a first stage constituting a converting means are written in the specific address of a flash memory 17 by using each sample or lot as a unit. Thus, switch circuits 14-1-14-n and 15-1 and 15-n can be selectively opened and closed, P channel type MOS transistors 16-1-16-n can be selectively turned on/off, and the variation of the detection reference of a low voltage detecting circuit can be corrected.</p> |
