| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor device, the internal potential of which can be easily adjusted. SOLUTION: A system LSI comprises a signal generator 54 for giving 16 level setting signals PT0-PT3 to an internal power source potential generator circuit 4 one by one to increment an internal power source potential intVCC in 16 steps, a comparator circuit 44 for comparing each internal power source potential intVCC with a reference potential VR to output a signalϕ44 of a level, corresponding to the comparison result and a memory circuit 45 for temporarily storing the output signalϕ44 from the comparator circuit 44. This facilitates detection of optimum level setting signals PT0-PT3, based on an output signalϕT from the memory circuit 45.
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