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<lkcl>
I2C bus, apparently, in the spec, the slave is permitted to told (drive) SCL low - even though master is trying to hold it HI - so that it has time to drive SDA. once the slave is happy that SDA will be valid, it releases its low-drive on SCL.
<Sarayan>
isn't i2c open-collector?
<tnt>
yes
<tnt>
(and that's called clock-stretching)
<Sarayan>
so master isn't hold much of anything, it's just letting go :-)