A high-keeper is used for Master-to-Slave and Slave-to-Master bus hand-off, as well as optionally when the Bus is idle. The high-keeper may be a passive weak pull-up resistor on the Bus, or an active weak pull-up or equivalent in the Master. The high-keeper only has to be strong enough to prevent system-leakage from pulling the Bus low. At the same time, the high-keeper has to be weak enough that a Slave with a normal IOL driver is able to pull the Bus line low within the minimum period.

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