Andrew,
The ADC overflow flag is only cleared immediately after reporting it. When you are doing single sweep, with an overflow condition (e.g. gain 2 atten 0), it reports the overflow, clears the flag, and then immediately sets the flag again (overflow condition still present). You set the attenuator to 10 dB (no more overflow), sweep, and it reports there was an overflow condition since the last time it was reported. But the next sweep reports no overflow.
This is the expected behavior. If this is not what you are seeing, let me know.
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