| 摘要 |
A hysteresis characteristic unit switches between outputs of selection instructions (SEL1, SEL2) in accordance with a status characteristic (ST1 and ST2) depending on a present selection state (history). Specifically, the hysteresis characteristic unit makes determination of switching in accordance with the status characteristic (ST1) if the selection instruction (SEL1) has been selected, and makes determination of switching in accordance with the status characteristic (ST2) if the selection instruction (SEL2) has been selected. If a charge/discharge voltage (Vb1) is lower than a charge/discharge voltage (Vb2) by an amount exceeding a switching threshold voltage (Vth1), switching from the selection instruction (SEL1) to the selection instruction (SEL2) is made.
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