Image-capturing apparatus, accessory apparatus and control method therefor
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United States of America Patent
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Sep 4, 2018
Grant Date -
Jan 25, 2018
app pub date -
Jul 18, 2017
filing date -
Jul 25, 2016
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Abstract
The image-capturing apparatus communicates with an accessory apparatus using a clock/communication request channel and first and second data communication channels. The camera controller switches its communication method between a first communication method in which data communication is performed while a clock signal is alternately switched between first and second levels and a second communication method in which data communication is performed in response to a communication request from the camera controller to the accessory apparatus, which is output by switching a signal level of the clock/communication request channel from the first level to the second level. The camera controller, in response to detecting a communication error in the first and second communication methods, transmits to the accessory apparatus through the second data communication channel a specific signal for restoring the communication while keeping the signal level of the clock/communication request channel at the first level.
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